Animals & Wildlife Sitemap - Page 6 2016-09-26

Steller's Sea Eagle
Steller's Sea Eagle. Animals & Wildlife.

African Fish Eagle
African Fish Eagle. Animals & Wildlife.

Bald Eagle
Pictures of birds of prey including bald eagles, Steller's sea eagles, Swainson's hawks, and more.

White-Tailed Eagle
White-Tailed Eagle. Animals & Wildlife.

White-Tailed Hawk
White-Tailed Hawk. Animals & Wildlife.

Swainson's Hawk
Swainson's Hawk. Animals & Wildlife.

Flamingos - Phoenicopteriformes - The Animal Encyclopedia
Flamingos are a group of wading birds with long legs and distinctive pink or red plumage. Flamingos inhabit tropical or subtropical areas.

Buttonquail - Turniciformes - The Animal Encyclopedia
Buttonquail are a group of ground-dwelling birds that inhabit the warm grasslands, scrublands and croplands of Europe, Asia, Africa and Australia.

Monarch Butterfly - Danaus plexippus - The Animal Encyclopedia
The monarch butterfly has a black body with white spots and bright orange wings with black borders and veins.

Feather Stars and Sea Lilies - Crinoidea - The Animal Encyclopedia
Feather stars and sea lilies are a group of echinoderms that include about 600 living species. Members of this group live attached the seafloor.

Skates and Rays - Batoidea - The Animal Encyclopedia
Batoids are flat-bodied fish. Some species are bottom dwellers that feed on a smorgasbord of marine invertebrates (clams, snails, oysters, crustaceans) and the occasional small fish.

Hammerhead Sharks - Sphyrnidae - The Animal Encyclopedia
The hammerhead sharks are a group of sharks that include nine species. Hammerheads are so named for the wide, flattened, hammer shape of their head.

Sharks - Selachimorpha - The Animal Encyclopedia
Sharks are a group of cartilaginous fishes widely known for their fearsome predatory nature, but some species of sharks are shy, gentle giants.

A Timeline of Evolution
This chart provides brief information about the various eons, eras, periods, and epochs that are used to describe the Earth's history.

Devonian Period - Paleozoic Era - Timeline of Biological History
Discover the secrets of a time when fishes ruled the Earth and when a few enterprising lobe finned fishes made the first tentative steps onto dry land.

Cambrian Explosion - The History of Life on Earth
The Cambrian Explosion was an evolutionary event unlike any other, when early organisms radiated into a dazzling array of different forms and body plans.

Swifts - Apodidae - The Animal Encyclopedia
Swifts are the fighter pilots of the avian world, capable of precise maneuvers and staggering flight speeds of up to 100 miles per hour.

Gastropods - Gastropoda - The Animal Encyclopedia
Gastropods are a group of mollusks that undergo torsion as they develop which results in a twisting of their body along its head-to-tail axis.

Cephalopods - Cephalopoda - The Animal Encyclopedia
Cephalopods are a group of mollusks that include octopuses, cuttlefish, squid and the chambered nautilus.

Red Sea Chromodoris - Chromodoris charlottae
The Red Sea chromodoris is a species of nudibranch that inhabits the Red Sea.

Golden-spotted nudibranch - Halgerda aurantiomaculata
The golden-spotted nudibranch is one of several closely related species of nudibranchs that have white bodies and orange markings.

Cratena Nudibranch - Cratena peregrina
The Cratena nudibranch is a species of nudibranch that occurs in the Mediterranean sea as well as along the Atlantic coastal regions of Spain, Portugal, the Canary Islands, and Senegal.

Meed the Nudibranchs
Nudibranchs are a group of marine gastropods that are notable for their elaborate colors and diverse body forms.

Pink Sea Slug - Coryphella pedata
Pink sea slugs inhabit the North Atlantic and is found in the waters around the British Isles.

Cockerell's Dorid Sea Slug - Limacia cockerelli
Cockerell's Dorid sea slug can be found in waters of the west coast of North America.

Yellow-Blue Nudibranch - Chromodoris kuniei
The yellow-blue nudibranch is a species of nudibranch that inhabits tropical areas of the west Pacific Ocean.

Janolus Sea Slug - Janolus cristatus
The Janolus sea slug is a nudibranch that inhabits the northeastern Atlantic from Norway to Morocco as well as the western Mediterranean Sea.

Phyllidia ocellata
Phyllidia ocellata is a nudibranch that has a distinct yellow, black, orange, and white color pattern.

Red-Finger Aeolis - Flabellina verrucosa
Red-finger Aeolis - Flabellina verrucosa

Chambered Nautilus - Nautilus pompilius - Mollusc Pictures
The nautiluses are the close cousins of the octopuses, cuttlefish and squids.

Common Cuttlefish - Sepia officinalis - Mollusc Pictures
The common cuttlefish is a large cuttlefish that inhabits the waters of the the Mediterranean Sea, North Sea, and Baltic Sea.

Mollusk Pictures
Pictures of mollusks, including bobtail squids, common cuttlefish, chambered nautiluses, argonauts, octopuses, snails, bivalves, and more.

Scallop - Pectinidae - Mollusc Pictures
Scallops are a group of bivalves that occur throughout the world's oceans.

Roman Snail - Helix pomattia - Mollusc Pictures
This Roman snail, also known as the edible snail (or escargot), belongs to a group of snails known as the typical snails.

European Squid - Loligo vulgaris - Mollusc Pictures
The European squid is large squid belonging to the clade of squids known as the pencil squids.

Atlantic Bobtail - Sepiola atlantica - Mollusc Pictures
The Atlantic bobtail is a species of bobtail squid that inhabits the waters of the northeastern Atlantic Ocean.

Greater Argonaut - Argonauta argo - Mollusc Pictures
The greater argonaut is a species of argonaut (also called paper nautiluses).

10 Facts About Mollusks
Boost your understanding of mollusks, a group of invertebrates known for their remarkable diversity—in both sheer number of species as well as variety of form.

Population Biology Basics
Explore the nitty gritty of population biology, a fascinating branch of zoology that investigates the ways in which populations change over time.

- By Category
An index of categories in the

The 3 Basic Amphibian Groups
Decode the secrets of amphibian classification in this beginner's guide to the three basic amphibian groups.

Global Action Plan Aims to Save Amphibians
A recent meeting of top scientists—experts in amphibian biology—paved the way for the future protection of amphibians around the globe.

The Biomes of the World - Animals and Wildlife - About.com
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Aquatic Biome
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Desert Biome
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Forest Biome
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Grassland Biome
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Tundra Biome
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.

Pigeon Guillemot - Cepphus columba - The Animal Encyclopedia
Pigeon guillemots belong to the auk family, a group of birds that includes guillemots, puffins, auklets, and murrelets.

Bobcat - Lynx rufus - The Animal Encyclopedia
Bobcats are small cats that inhabit a range that stretches throughout a large portion of North America, from southern Canada to southern Mexico.

Wandering Albatross - Diomedea exulans - The Animal Encyclopedia
The wandering albatross is among the largest living birds and has the largest wingspan of all birds alive today.

Siberian Tiger - Panthera tigris altaica - The Animal Encyclopedia
The Siberian or Amur tiger is the largest of all the tiger subspecies. It has a reddish-orange coat that fades to white on its face and belly.

Great White Shark - Carcharodon carcharias - The Animal Encyclopedia
Great white sharks are usually solitary hunters that feed primarily on seals, dophins, large fish, and sea lions.

Bats - Chiroptera - The Animal Encyclopedia
Bats are the worlds only group of mammals that have wings.

Cranes, Coots, and Rails - Gruiformes - The Animal Encyclopedia
Cranes, coots and rails are a varied group of birds that generally have a short tail, long neck and rounded wings.

Hummingbirds - Trochilidae - The Animal Encyclopedia
Hummingbirds are small birds that have a long, narrow beak and a long thin tongue. They are notable for their ability to hover in flight.

Red-Eyed Tree Frog - Agalychnis callidryas - The Animal Encyclopedia
The red-eyed tree frog is a vibrantly colored frog with large red eyes, a green body and light blue sides with yellow strips.

Types of Animal Classification
Animals & Wildlife. Page 2.

What Is a Missing Link?
The term

The Big Events That Shaped Life on Our Planet
To better understand living animals, it helps to examine the organisms that have lived throughout the history of our planet.

How Animals Are Classified
For centuries, the naming and classification of living organisms into groups has been an integral part of the study of nature.

Classifying Animals and Wildlife
Animals & Wildlife. Page 3.

How Animals and Wildlife are Classified
Animals & Wildlife. Page 4.

Aquatic Biome - The Habitat Encyclopedia
The aquatic biome consists of habitats around the world that are dominated by water, from tropical reefs, to brackish mangroves, to Arctic lakes.

Cheetah - Acinonyx jubatus - The Animal Encyclopedia
Cheetahs are the world's fastest land animal, they can achieve speeds of up to 110km/h but they can only maintain these bursts for short periods of time.

Leopard - Panthera pardus - The Animal Encyclopedia
The leopard is a large cat that has a pale, cream-yellow coat with solid black spots.

Scientific Method: How To Study The Natural World
The scientific method is a series of steps scientists take to acquire, test, and describe the natural world.

Arctic Wolf - Canis lupus arctos - The Animal Encyclopedia
The Arctic wolf, also known as the white wolf, is a subspecies of grey wolf that lives in the Canadian Arctic, Alaska, and northern Greenland.

10 Facts About Dolphins
Learn interesting facts about dolphins and find out about the characteristics make them different from other animal groups, their life cycle and their evolutionary history.

Toothed Whales - Odontoceti - The Animal Encyclopedia
Toothed whales, as their name implies, have teeth, a characteristic that distinguishes them from their baleen whales.

Florida Panthers: Revived, with a Texan Twist
Florida panthers are healthier and fitter than they were fifteen years ago. They have higher diversity, better immunity, and fewer genetic problems.

The Migration of the Christmas Island Red Crab
For most of the year, Christmas Island red crabs can be classified as pretty lazy crabs. During the dry season, these crabs rest in their burrows.

Habitat Loss, Fragmentation, and Destruction
Habitat destruction is fueled by a fast-growing human population. As human populations increase, we use more land for agriculture, cities, and towns.

Velvet Worms - Onychophora - The Animal Encyclopedia
Velvet worms, also known as walking worms, are a group of invertebrates that are notable for their paired legs, soft skin, and long antennae.

Mollusks - Mollusca - The Animal Encyclopedia
Mollusks are a group of invertebrates that includes squids, octopuses, cuttlefishes, nudibranchs, snails, slugs, limpets, mussels, and many more.

Saving the Large Blue Butterfly
A striking cobalt-blue butterfly from the United Kingdom is making headlines as a conservation success story.

Cobras - Elapidae - The Animal Encyclopedia
Cobras are a group of venomous snakes with hollow venom fangs and bright coloration. All cobras produce a fast-acting and deadly neurotoxic venom.

Christmas Tree Worm - Great Barrier Reef Pictures
Christmas tree worms are small, tube-building polychaete worms that live in marine environments. Christmas tree worms are named after the colorful, spiral breathing structures they extend into the surrounding water which resemble tiny Christmas trees. Page 3.

Coral - Great Barrier Reef Pictures
Corals are a group of colonial animals that form the structural framework of the reef. Corals provide habitat and shelter for many other reef-dwelling creatures. Corals form mounds, branches, shelves and tree-like structures that give the reef its dimension. Page 5.

Maroon Clownfish - Great Barrier Reef Pictures
The maroon clownfish inhabits the Indian and Pacific Oceans. Their range stretches from western Indonesia to Taiwan and includes the Great Barrier Reef. The maroon clownfish has white or in some cases yellow stripes on their body. Female out-size males and are a darker shade of red. Page 4.

Aerial View - Great Barrier Reef Pictures
The Great Barrier Reef is the world's largest tropical reef system, covering an area of 348,000 km2 and stretching along 2300km of the eastern Australian coastline.

Marine Fish - Great Barrier Reef Pictures
Over one thousand species of marine fish live in the Great Barrier Reef. This picture and profile explores the marine fish of the Great Barrier Reef. Page 9.

Animal Senses: Beyond the Five Human Senses
Man-made radars and infrared detectors help humans to stretch their awareness beyond their five senses. However, animals have their own set of senses.

Colugos - Cynocephalidae - The Animal Encyclopedia
Colugos, also known as flying lemurs, are arboreal, gliding mammals that inhabit the forests of Southeast Asia.

Pikas - Ochotonidae - The Animal Encyclopedia
Pikas are a group of lagomorphs that inhabit mountains, rocky terrain, semi-deserts, and high-elevation plains in North America, Europe, and Asia.

Turtles - Testudines - The Animal Encyclopedia
Turtles are a group of reptiles best known for the hard shell which is a modification of their ribcage and vertebral column.

Introducing the Magombera Chameleon
Attention all chameleon fans! It's official: there is now one more species of chameleon known to science.

The Unique Vision of Mantis Shrimp
Mantis shrimp are the visionaries of the animal kingdom. These small marine invertebrates have the most complex eyes of any living creature.

Tree Frog Embryos Delay Hatching
Scientists from Boston University have discovered that the embryos of red-eyed tree frogs use most of the oxygen within their eggs before they hatch.

Tree Frog Eggs Fit for Land or Water
Scientists from Boston University have discovered that the yellow tree frog is able to lay its eggs on land or in water.

Komodo Dragons Pack a Venomous Bite
Komodo dragons deliver a venomous bite to their victims, a fact that makes this already fearsome giant reptile all the more formidable.

Polar Bear Under Review for Endangered Status
The US Fish and Wildlife Service announced recently that they will consider whether to place the Polar Bear on the list of species protected under the US Endangered Species Act.

New Shark Species: Carolina Hammerhead
A new species of hammerhead shark was discovered by a team of scientists who were studying fish diversity in South Carolina's rivers and coastal waters.

Muskox - Ovibos moschatus - The Animal Encyclopedia
Muskoxen are large, hoofed mammals that lives north of the tree line on the arctic tundra. The species is native to Canada, Greenland and Alaska.

Hexapods - Hexapoda - The Animal Encyclopedia
Hexapods are a diverse group of six-legged arthropods. Most hexapods are insects but a handful belong to the lesser-known group, the springtails.

Flatworms - Platyhelminthes - The Animal Encyclopedia
Flatworms are a group of invertebrates that includes planarians, tapeworms, and flukes. Flatworms include both free-living and parasitic species.

True Owls - Strigidae - The Animal Encyclopedia
True owls are predatory birds that range in size from the tiny elf owl to the large great horned owl.

What Reptiles Eat - Animals and Wildlife - About.com
What reptiles eat differs from species to species but here you'll find out about some of the general dietary trends for various reptiles.

Owls - Strigiformes - The Animal Encyclopedia
Owls are a group of birds that have strong talons, a downward-curved bill, acute hearing, and keen eyesight.

Peppered Moths: A Natural Selection Case Study
H.B.D. Kettlewell, an English physician, had an interest in butterfly and moth collecting that lead him to explain the color variations of London's peppered moths.

Mammalian Temperature Regulation
To maintain correct body temperature, mammals must conserve body heat in cold conditions and dissipate extra body heat in warmer conditions.

Shoebill - Balaeniceps rex - The Animal Encyclopedia
The shoebill is large grey-plumed bird with a bulky, sharp bill.

Alpine and Montane Habitats
Mountains are masses of rock that have been pushed upward, high above the surrounding land.

Facts About Pelicans - The Animal Encyclopedia
Pelicans have webbed feet and are well adapted to catching fish, their primary food source. Many species dive or swim underwater to capture prey.

Animal Cells, Tissues, Organs and Organ Systems
To understand animals and their biology, it helps to understand the cells, tissues, organs and organ systems that comprise them.

The Chemistry of Animal Life
Animals, like all lifeforms, are composed of and dependent upon the chemicals of life. To understand the chemistry of life, we need to first understand the basics of general chemistry.

Geckos - Gekkonidae - The Animal Encyclopedia
Geckos are a group of lizards that include the tokay gecko, crested gecko, gargoyle gecko, dwarf gecko, leopard gecko and many more.

Zoology: The Science and Study of Animals
Zoology is the study of animals; yet this definition implies a simplicity that does not exist; instead, zoology is a complex discipline, drawing upon a diverse body of scientific observation and theory.

Northern Gannet - Morus bassanus - The Animal Encyclopedia
Northern gannets are a species of pelican that has white feathers and it has a long powerful bill, well-adapted for capturing fish.

Spectacled Bear - Tremarctos ornatus - The Animal Encyclopedia
Spectacled bears are the only bear species that lives in South America. They inhabit cloud forests at elevations between 3300 to 8900 feet.

Sun Bear - Helarctos malayanus - The Animal Encyclopedia
The sun bear is a small species of bear that has black fur and a distinct, crescent-shaped patch of brown fur on their chest.

Giant Panda - Ailuropoda melanoleuca - The Animal Encyclopedia
Giant pandas are a species of bear that has a distinct black and white coloration. They have a diet that consists of almost entirely bamboo.

Oceanic Dolphins - Delphinidea - The Animal Encyclopedia
Oceanic dolphins are a group of cetaceans that includes dolphins, pilot whales, and killer whales. Many species of oceanic dolphins are highly social.

Mouse-Like Rodents - Myomorpha - The Animal Encyclopedia
Mouse-like rodents are a group of rodents that differ from other rodents in the arrangement of their jaw muscles and the structure of their teeth.

Hyraxes - Hyracoidea - The Animal Encyclopedia
Hyraxes are a group of mammals that include four living species: the southern tree hyrax, western tree hyrax, yellow-spotted rock hyrax, and the rock hyrax.

Nine-Banded Armadillo - Dasypus novemcinctus - The Animal Encyclopedia
The nine-banded armadillo is a mammal that has bony armor and leathery skin covering its body, with eight to ten bony bands encircle its midriff.

Southern Tamandua - Tamandua tetradactyla - The Animal Encyclopedia
The southern tamandua is an anteater with an elongated snout that feeds on ants, termites, and bees.

Are Jellyfish Mixing Up the Oceans?
A pair of Caltech scientists attracted attention when they suggested an unconventional source of ocean water mixing. Hint: it involves jellyfish.

Wetlands - The Habitat Encyclopedia
Wetlands are habitats that fall somewhere on the environmental spectrum between land and water.

The Domestication of Horses
Domestication is the process by which humans take wild species and acclimatize them to breeding and surviving in captivity.

Organ Systems in Animals
Animals' bodies are made up of various organ systems, groups of organs that work together to perform a function.

What Is A Rainshadow - Animals and Wildlife - About.com
A rain shadow is an area of dry land on the leeward side of a mountain. This profile explores the geography, habitat, and wildlife of rain shadows.

Northern Bottlenose Whale - Hyperoodon ampullatus - The Animal Encyclopedia
The northern bottlenose whale is a beaked whale that has a gray body, dark brown to gray tail, and a light forehead and a small beak.

How Do Coral Reefs Form?
Stony corals are a remarkable group of animals that inhabit tropical marine waters around the world and form vast colonies known as coral reefs

Galapagos Land Iguana - Conolophus subcristatus - The Animal Encyclopedia
The Galapagos land iguana is dark brown to yellow-orange in color and has large pointed scales that run along its neck and down its back.

Chameleons - Chamaeleonidae - The Animal Encyclopedia
Chameleons are a group of lizards that are most noted for their unique feet, stereoscopic eyes and lighting-fast tongues.

Facts About Snowy Owls
Snowy owls are large owls with white plumage and their extreme northerly range which includes tundra habitat throughout Alaska, Canada and Eurasia.

Niche - Definition - Zoology Glossary
Definition of a niche, a term used to describe the role an organism or population plays within its community or ecosystem.

Scanning DNA Barcodes in Sea Turtles
Little chunks of DNA can act as unique barcodes that enable scientists to identify an organism. Find out what that means for sea turtle conservation.

Maui Ocean Center
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Lobster's Unique Sounds Defy Predators
Scientists now understand more about the unique way spiny lobsters create sound to ward off predators.

White-lipped snail - Cepaea hortensis - Snail Pictures
Animals/Wildlife. Page 11.

Cospe Snail - Arianta arbustorum - Snail Pictures
Animals/Wildlife. Page 9.

Terrestrial Snail Pictures
The shell of a terrestrial snail is often a key feature used to identify the snail's species. In this gallery, you'll find profiles for six terrestrial snails--Roman snails, garden snails, giant Ghana snails, East African land snails, cospe snails, and white-lipped snails.

East-African Land Snail Shell - Achatina fulica - Snail Pictures
Animals/Wildlife. Page 8.

Garden Snail - Helix aspersa - Snail Pictures
The garden snail, is a terrestrial snail that is native to eastern and western Europe, northwest Africa, Iberia, Anatolia, and the British Isles. Page 3.

Garden Snail Shell - Helix aspersa - Snail Pictures
Animals/Wildlife. Page 4.

Giant Ghana Snail - Achatina achatina - Snail Pictures
Giant Ghana Snail - Achatina achatina. Page 5.

Giant Ghana Snail Shell - Achatina achatina - Snail Pictures
Animals/Wildlife. Page 6.

Roman Snail - Helix pomatia - Snail Pictures
The Roman snail, also known as the Burgundy snail, is a species of terrestrial snail. This picture and profile introduces you to the Romain snail.

East-African Land Snail - Achatina fulica - Snail Pictures
Animals/Wildlife. Page 7.

Roman Snail Shell - Helix pomatia - Snail Pictures
The shell of the Roman snail is brown and has several light brown bands. It is quite large, measuring between 4 and 5 centimeters in height and diameter for adult snails. Page 2.

Cospe Snail Shell - Arianta arbustorum - Snail Pictures
Animals/Wildlife. Page 10.

White-Lipped Snail Shell - Cepaea hortensis - Snail Pictures
Animals/Wildlife. Page 12.

Counter Shading
Counter shading is a common color pattern in animals in which the dorsal side (upper side) of the animal is darker than their ventral (lower) side. Such a color pattern provides camouflage for the animal when viewed from above, below, and even from the side.

Blue Whale - Balaenoptera musculus - The Animal Encyclopedia
Profile of the blue whale, the largest living animal. Blue whales belong to the group of whales know as the baleen whales.

Worm Lizards - Amphisbaenia - The Animal Encyclopedia
Profile of worm lizards, a group of squamates that include about 130 living species that live underground for most of their life.

What is Camouflage for Animals? - Definition
Definition of Camouflage and how it helps animals.

Bird Watching Tips for Beginners
Identifying a bird can be at once challenging and rewarding. To gain the best chance of naming a bird, you'll want to know just what to look for.

Ostrich - Four Ostriches
Ostriches have been the largest living bird for over five centuries, ever since the giant elephant birds of Madagascar went extinct. Page 8.

Ostrich - Ostrich Close-Up
Ostriches have the largest eye of any living terrestrial vertebrate, measuring 2 inches in diameter. Page 10.

Ostrich - Ostrich Close-Up
Ostriches have two toes on each foot, a characteristic that sets them apart from all other birds, which have four toes on each foot. Page 5.

Ostrich - Ostrich Dusting
Ostriches eat mostly plant material, though at times they may also feed on insects and small vertebrates. Page 11.

Ostrich Pair
Ostriches have a powerful kick that they put to use during the breeding season when males duke it out for control of harems. Page 9.

Ostrich - Ostrich Pair
The common ostrich (Struthio camelus) is a record-breaking bird. It's the tallest and heaviest species of all living birds. Page 4.

Ostrich - Ostrich Silhouettes
Although its bulky body means that flying is out of the question, the ostrich has adapted to life on the ground with impressive agility.

Ostrich Running
Ostriches live in Africa and occupy a variety of habitats including deserts, semiarid plains, savannas and open woodlands. Page 7.

Ostriches - Ostriches Running
Ostriches are superb runners that can sprint at speeds of up to 45 mph. The ostrich is also an endurance runner and can jog at a slick 30 mph for as long as a half an hour. Page 2.

Ostrich - Two Ostriches
During the breeding season, ostriches form flocks of between 5 and 50 individuals, often intermingling with grazing mammals such as zebras and antelope. Page 12.

Ostrich - Wild Ostrich Running
Ostriches belong to a clan of flightless birds called the ratites. Ratites have a smooth breastbone which lacks a keel. Page 3.

Ostrich - Ostrich and Eggs
Ostriches lay 3-pound eggs, which measure some 6 inches in length and 5 inches in diameter, making them the title of largest egg produced by any living bird. Page 6.

Shark Pictures
Shark Pictures

Ostrich Pictures
Pictures of ostriches, the tallest and heaviest species of all living birds. Although its bulky body means that flying is out of the question, the ostrich has adapted to life on the ground with impressive agility.

Tarpons, Eels, and Halosaurs - Elopomorpha - The Animal Encyclopedia
Tarpons, eels and halosaurs are a group of ray-finned fishes that include about 800 species.

Teleosts - Teleostei - The Animal Encyclopedia
Teleosts are a diverse group of ray-finned fishes that include most of the world's best-known commercial and sport fishes.

Caribou - Rangifer tarandus - The Animal Encyclopedia
Caribou, also known commonly as reindeer, are members of the deer family that inhabit boreal forests and tundra of North America, Siberia, and Europe.

Pangolins - Manis - The Animal Encyclopedia
Pangolins, also known as scaly anteaters or trenggilings, are a group of mammals that have large, plate-like scales covering their body.

Lava Lizard - Microlophus albemarlensis - The Animal Encyclopedia
The lava lizard is a species of lizard native to the Galapagos Islands. Females are notable for the distinct red patch on their throat and cheeks.

Baleen Whales - Mysticeti - The Animal Encyclopedia
Baleen whales are large filter-feeding marine mammals that are named for the specialized filter-like structures in their mouth.

Monotremes - Monotremata - The Animal Encyclopedia
Monotremes are a group of mammals that include echidnas and the platypus.

Equids - Equidae - The Animal Encyclopedia
Equids include horses, zebras, and asses. Equids are beautiful, graceful mammals that have long slender legs, a stocky body, and long, narrow heads.

Dugong - Dugong dugon - The Animal Encyclopedia
Dugongs are marine mammals that feed on sea grass and the roots of aquatic plants in sheltered coastal waters.

Eland Bull - Tragelaphus oryx
Knee clicks provide a measure of the animal's size. Page 5.

Eland Antelope - Tragelaphus oryx
Finally, hair darkness provides a measure of relative aggressiveness. Page 6.

Eland Bull and Two Females - Tragelaphus oryx
Bro-Jrgensen and Dabelsteen recorded data for eland antelopes in Kenya's Masai Mara National Reserve and the Olare Orok Conservancy. Page 3.

Eland Bull - Tragelaphus oryx
Each signal conveys a different type of information. Page 4.

Young Eland Bull - Tragelaphus oryx
This complex communication process between rivals—referred to as agonistic signaling—is the focus of research reported earlier this month in the journal BMC Biology. Page 2.

Eland Antelope Pictures
Eland antelopes are the largest antelopes in the world but their considerable size doesn't mean they're eager to throw their weight around.

Eland Antelope - Tragelaphus oryx
When settling disputes, male elands send out a set of signals that accurately reflect their size, age, and aggressiveness to other males.

White Rhinoceros - Ceratotherium simum - The Animal Encyclopedia
Profile of the white rhinoceros, a large herbivore and one of five living species of rhinoceroses.

Why Are Amphibians in Decline?
In recent years, scientists and conservationists have been working to raise public awareness of a global decline in amphibian populations.

Natural Resources Defense Council
The Natural Resources Defense Council is an environmental organization with 350 lawyers, scientists, and other professionals and 1.3 million members.

Conservation International
Conservation International is an organization that aims to help stabilize global climate, protect fresh water, and ensure human well-being.

International Crane Foundation
The International Crane Foundation works around the world to protect cranes and the habitats on which they depend.

Oceana
Oceana seeks to preserve the very core of our planet's health by protecting its oceans.

World Wildlife Fund
The World Wildlife Fund is a global-scale conservation organization that works in 100 countries and consists of nearly 5 million members worldwide.

Edge Habitats - Animals On the Edge
Across the globe, human development now fragments a once-continuous landscape into isolated patches of natural habitats.

Gharial - Gavialis gangeticus - The Animal Encyclopedia
Gharials have a long slender snout that makes the easily distinguishable from their wider-faced crocodile, alligator and caiman cousins.

Endangered Grenada Dove Set to Lose Vital Habitat
The Grenada dove is set to lose a large portion of its dry-forest habitat as plans take shape to build a luxury hotel in what is now Grenada's Mount Hartman National Park.

Mammal Characteristics
Mammals display a remarkable array of adaptations, some of which (hair, mammary glands, specialized ear bones) are shared by no other animal groups.

10 Facts About Bears
Facts about bears, a group of carnivores known for their burly build, impressive agility and, in some species, their winter sleep habits.

Barn Owls - Tytonidae - The Animal Encyclopedia
Barn owls are a group of owls that have a heart-shaped face, long legs and powerful talons. Barn owls are medium-sized birds with a large wingspan.

Amazon River Basin Animals
A list of animals of the Amazon River basin in South America including harpy eagles, three-toed sloths, toucans, and more.

Clean Water Act
The Federal Water Pollution Control Act, also known more commonly as the Clean Water Act, came into effect in 1972.

American Alligator - Alligator mississippiensis - Crocodilia Pictures
The American alligator is one of two living species of alligators. The American alligator inhabits the wetlands and swamps in the Southeastern United states. Their range stretches along the Gulf Coasts of Texas, Louisiana, Mississippi, Alabama, and Florida as well as northward into Georgia and the Carolinas. Page 11.

American Alligator - Alligator mississippiensis - Crocodilia Pictures
The American alligator is one of two living species of alligators. The American alligator inhabits the swamps of the Southern United States. Page 6.

American Alligator - Alligator mississippiensis
The American alligator is one of two living species of alligators. The American alligator inhabits the swamps of the Southern United States. Page 5.

American Alligator - Alligator mississippiensis - Crocodilia Pictures
The American alligator is one of two living species of alligators. The American alligator inhabits the wetlands and swamps in the Southeastern United states. Their range stretches along the Gulf Coasts of Texas, Louisiana, Mississippi, Alabama, and Florida as well as northward into Georgia and the Carolinas. Page 12.

Caiman - Caimaninae - Crocodilia Pictures
Caimans inhabit the tropical swamps and rivers of Central and South America. Like alligators, caimans have broad, blunt-shaped snouts. Page 9.

Caiman - Caimaninae - Crocodilia Pictures
Caimans inhabit the tropical swamps and rivers of Central and South America. Like alligators, caimans have broad, blunt-shaped snouts. Page 10.

Crocodile - Crocodylinae - Crocodilia Pictures
Animals/Wildlife. Page 8.

Gharial - Gavialis gangeticus
Gharials are the only living member of their family, the Gavialidae. These crocodilians are easily distinguished from other crocodilians thanks to their long, slender snout and the rows of spiky scales that border its tail. Page 4.

Nile Crocodile Hatchling - Crocodylus niloticus
The Nile crocodile was once common throughout most of eastern and southern Africa but today, their numbers are fewer. Page 2.

Nile Crocodile - Crocodylus niloticus
The Nile crocodile was once common throughout most of eastern and southern Africa but today, their numbers are fewer.

Saltwater Crocodile - Crocodylus porosus
Saltwater crocodiles inhabit a range that includes the Northern Australia, India and Southeast Asia. Saltwater crocodiles are the largest living reptiles. Page 3.

Spectacled Caiman - Caiman crocodilus - Crocodilia Pictures
The spectacled caiman, so named for the distinct ridge of bone between its eyes, inhabits the swamps and rivers of Central and South America. Page 7.

Crocodilia Pictures
Pictures of crocodilians including Nile crocodiles, saltwater crocodiles, gharials, American alligators, spectacled caimans and many more.

Tuatara - Rhynchocephalia - The Animal Encyclopedia
Tuatara are a rare group of reptiles that include only two living species that inhabit the small rocky islands off the coast of New Zealand.

Descent With Modification - Definition
Descent with modification refers to the passing on of traits from parent organisms to their offspring.

Three Polar Bears
The fur of a polar bear is a creamy color, not pure white, and they have black skin. Page 10.

Polar Bear on Svalbard
Polar bears are the second largest species of bears, smaller than only the brown bear.This picture and profile introduces you to the polar bear. Page 8.

Polar Bear Standing on Ice
Polar bears have a dense underfur and thick layer of fatty blubber to aid in insulation. Page 9.

Polar Bear in Svalbard, Norway
Polar bears (Ursus maritimus) are the largest land carnivores alive today, comparable in size only to brown bears (Ursus arctos). Page 12.

Polar Bear - Two Polar Bears
Polar bears' size helps them conserve heat. The larger the bear, the more slowly they loose heat. Page 11.

Polar Bear - Lone Polar Bear
Animals/Wildlife.

Polar Bear on Land
Animals/Wildlife. Page 7.

Polar Bear - Polar Bear Portrait
Animals/Wildlife. Page 5.

Polar Bear and Cubs
Animals/Wildlife. Page 6.

Polar Bear - Polar Bear Sleeping
Animals/Wildlife. Page 3.

Polar Bears Wrestling
Animals/Wildlife. Page 2.

Polar Bear - Two Polar Bears
Animals/Wildlife. Page 4.

Osprey - Pandion haliaetus - The Animal Encyclopedia
Osprey are large diurnal hunters and are among the most widespread of all birds of prey.

Storm Petrels - Hydrobatidae - The Animal Encyclopedia
Storm petrels are a group of small seabirds that spend most of their time at sea and journey back to land only to breed.

10 Facts About Squamates
Learn interesting facts about squamates and find out about the characteristics make them different from other reptile groups.

The Evolutionary Lessons of Marsupials
By 110 million years ago, mammals had diverged into two groups: the placental mammals and the marsupial mammals.

Canada Goose - Branta canadensis - The Animal Encyclopedia
The Canada goose is a large goose with a black head and neck, a white throat patch, and a brown body.

Giant Anteater - Myrmecophaga tridactyla - The Animal Encyclopedia
Giant anteaters have long, tubular snouts, well adapted for working its way into the ant hills and termite nests it rips open with its large claws.

The Elusive Ivory-Billed Woodpecker
On the afternoon of February 11, 2004, a lone kayaker paddling the bayous of the Cache River in Arkansas spotted something rare and remarkable.

Prides and Coalitions: The Social Lives of Lions
Lions are definitely not loners. In fact, lions are unique among felids in that they are the only species of cat that forms social groups.

Spotted Hyena - Crocuta crocuta - The Animal Encyclopedia
The spotted hyena is a scavenger that inhabits the grasslands, savannahs, and semi-deserts of sub-Saharan Africa.

Perching Birds - Passeriformes - The Animal Encyclopedia
Perching birds are a group of birds known for their specialized feet and the complex vocalizations and songs.

Crows, Ravens and Jays - Corvidae - The Animal Encyclopedia
Crows, ravens and jays are a group of perching birds that includes jackdaws, rooks, magpies and nutcrackers.

Mountain Lion - Puma concolor - The Animal Encyclopedia
Mountain lions are large, lean cats with a coat that ranges in color from yellow-brown to gray-brown.

Albatrosses - Diomedeidae - The Animal Encyclopedia
Albatrosses are a group of tubenose seabirds that includes great albatrosses, North Pacific albatrosses, mollymawks and sooty albatrosses.

Albatrosses and Petrels - Procellariiformes - The Animal Encyclopedia
Albatrosses and petrels are a group of seabirds that spend most of their time at sea, gliding over the open water.

Polar Bear Pictures
Pictures of polar bears, the second largest species of bear alive today, smaller than only the brown bear.

Saving Russia's Rare Panthers
On Russia's eastern coast lies one of the world's most unique temperate forests. The region is home to two of the most endangered cats in the world.

Sandgrouse - Pteroclidiformes - The Animal Encyclopedia
Sandgrouse are a group of medium-sized terrestrial birds that inhabit Africa, Madagascar, the Middle East, central Asia, India, and Iberian Peninsula.

Penguins - Sphenisciformes - The Animal Encyclopedia
Penguins are flightless birds that have stiff wings and distinct coloration, with black or gray feathers on their backs and white feathers on their bellies.

Endangered Snow Leopards Threatened by Poachers
Snow leopards inhabit the mountains, semi-arid scrublands, grasslands and steppe habitats throughout central and southern Asia.

Kingfishers - Coraciiformes - The Animal Encyclopedia
Kingfishers and their relatives are a group of mostly carnivorous birds that includes kingfishers, toddies, rollers, bea-eaters, motmots, hoopies and hornbills.

Loons - Gaviiformes - The Animal Encyclopedia
Loons, also known as divers, are freshwater diving birds that inhabit lakes throughout the northern parts of North America and Eurasia.

Kiwis - Apterygiformes - The Animal Encyclopedia
Kiwis are endemic to New Zealand and are the country's national bird. These flightless birds have tiny vestigial wings.

Gouldian Finch - Erythrura gouldiae - The Animal Encyclopedia
The Gouldian finch is a brightly colored bird endemic to Australia. Adult Gouldian finches have a face that is either black or red.

Tufted Titmouse - Baeolophus bicolor - The Animal Encyclopedia
The tufted titmouse is a small, gray-plumed songbird, easily recognized for the crest of gray feathers atop its head and its big black eyes.

Poaching Threat to Northern White Rhinos
Recent poaching in Garamba National Park in the Democratic Republic of Congo threatens the few remaining wild northern white rhinos in the region.

Flight - The Natural History of Flight
The story of the evolution of flight is not one limited to birds. Flight evolved not only in birds, but also in insects and mammals.

Gamebirds - Galliformes - The Animal Encyclopedia
Gamebirds are a group of birds that includes chickens, pheasants, quails, turkeys, grouse, currasows, guans chachalacas, guineafowl and megapodes.

Remembering Martha: The Last Passenger Pigeon
The extinction of the passenger pigeon in 1914 teaches us a great deal about our role in the decline of our fellow species, then and now.

Cool Chameleons Don't Miss Meals
For cold-blooded animals, the colder it gets, the harder life gets. Yet despite any dips in temperatures, chameleons still manage to snag a meal.

The Mystery of North America's Black Wolves
Despite their name, gray wolves are colorful canines. Their coat color ranges from white to gray to black and is regulated by complex genetic factors.

Laysan Albatross - Phoebastria immutabilis - The Animal Encyclopedia
The Laysan albatross is a small albatross that has white plumage on their head, neck, and body and black plumage on their wings and tail.

Waved Albatross - Phoebastria irrorata - The Animal Encyclopedia
The waved albatross is a critically endangered albatross that breeds on Espanola Island in the Galapagos Archipelago.

Pigeons - Columbiformes - The Animal Encyclopedia
Pigeons and doves are a group of birds that includes about 312 species such as Old World pigeons, American pigeons, quail-doves, and many others.

Cuckoos and Turacos - Cuculiformes - The Animal Encyclopedia
Cuckoos and their allies form a group of birds that includes turacos and their allies, cuckoos, coucals, anis and the hoatzin.

Evolving Egg Patterns Thwart Cuckoo Counterfeits
Detecting forgeries isn't just the business of hand-writing experts and forgery sleuths. It turns out some birds are skilled in detecting fraud too.

Horseshoe Crabs - Limulidae - The Animal Encyclopedia
Horseshoe crabs are an ancient group of arthropods whose bodies are encased in a hard, oval shell.

Protecting the Polar Bear
The polar bear has an uncertain future. Its habitat is retreating rapidly, as yearly increases in global temperatures reduce the extent of sea ice.

The Tangled Web of Spider Classification
Spider classification is a complicated business. Since 1900, taxonomists have reshuffled the spider family tree nearly 20 times.

What Is Royal Jelly
Also known as bee's milk, royal jelly is a creamy substance produced by young nurse worker bees. The jelly is secreted from the hypopharyngeal gland.

How Fossils Are Prepared
Fossil preparation is a process by which scientists remove the sediment or rock--also referred to as the matrix--in which the fossil is preserved.

Reasons for Decline - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Conservation Background - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Life Cycle - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Fooling the Right Ants - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Grass Length - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Conservation Success - The Conservation of the Large Blue Butterfly
A striking cobalt-colored butterfly from the United Kingdom is making headlines as conservation success story.

Boas - Boidae - The Animal Encyclopedia
Boas are a group of nonvenomous snakes that live in North and South America, Africa, Madagascar, Europe and the Pacific Islands.

Scientists Declare New Species of Leopard
Scientists have discovered that the clouded leopards that prowl the islands of Sumatra and Borneo are different to those that inhabit the mainland.

What Is a Species - An Introduction to Evolution
The term species can be defined as a group of individual organisms that exist in nature and, under normal conditions, are capable of interbreeding to produce fertile offspring.

How Evolution Works - An Introduction to Evolution
There are four basic mechanisms by which biological evolution takes place. These include mutation, migration, genetic drift, and natural selection.

Phylogenetics - An Introduction to Evolution
Phylogenetics is the science of constructing and evaluating hypotheses about evolutionary trees and patterns of descent among organisms past and present.

Descent with Modification - An Introduction to Evolution
Biological evolution is defined as descent with modification. Descent with modification refers to the passing on of traits from parent organisms to their offspring.

The Fossil Record - An Introduction to Evolution
Fossils are the remains of organisms that lived in the distant past. For a specimen to be considered a fossil, it must be of a specified minimum age (often designated as greater than 10,000 years).

History of Life on Earth - An Introduction to Evolution
A brief overview of the history of life from the time the first life evolved until the present day. Page 2.

What is Evolution - An Introduction to Evolution
Evolution is change over time. Under this broad definition, evolution can refer to a variety of changes that occur over time—the uplifting of mountains, the erosion of riverbeds, or the creation of new species.

Natural Selection - An Introduction to Evolution
Natural selection is the means by which beneficial variations in a population tend to be preserved while unfavorable variations tend to be lost.

Sexual Selection - An Introduction to Evolution
Sexual selection is a type of natural selection that acts on traits related to attracting mates.

Coevolution - An Introduction to Evolution
Coevolution is the evolution of two or more groups of organisms together, each in response to the other.

Green Poison Dart Frog - Dendrobates auratus - The Animal Encyclopedia
Green poison dart frogs are vibrantly colored frogs that secrete a toxin from their skin that serves to deter predators.

Red Fox - Vulpes vulpes - The Animal Encyclopedia
The red fox is the largest species of fox and is among the most widespread mammals. Its range includes most areas throughout the Northern Hemisphere.

Salamander Populations Shrink in Recent Decades
The decline in amphibian populations around the world has focused mostly on frogs. Now, a new study raises concerns for salamander populations too.

Cetaceans: The Unexpected Ungulates
You may wonder why a group of mammals who not only lack hooves, but don't even have feet are considered to be close kin to the artiodactyls.

Sea Lions - Otariinae - The Animal Encyclopedia
Sea lions are a group of marine mammals that live in a variety of coastal habitats, from the subarctic to tropics (including San Francisco's Pier 39).

Friends of Haleakala National Park
The Friends of Haleakala National Park conservation organization supports a wide range of conservation projects to protect Hawaii's unique Haleakala National Park.

American Oystercatcher - Haematopus palliatus
The American oystercatcher is one of the birds threatened by the Gulf oil spill.

Black Skimmer - Rynchops niger
The black skimmer is one of the birds threatened by the Gulf oil spill. Page 15.

Black Skimmer - Rynchops niger
The black skimmer is one of the birds threatened by the Gulf oil spill. Page 16.

Birds Threatened by Gulf Oil Spill
Laughing gulls, royal terns, brown pelicans and roseate spoonbills are some of the many species of birds threatened by the oil spill in the Gulf of Mexico.

Birds Threatened by Gulf Oil Spill
Laughing gulls, royal terns, brown pelicans and roseate spoonbills are some of the many species of birds threatened by the oil spill in the Gulf of Mexico.

Brown Pelican - Pelecanus occidentalis
The brown pelican is one of the birds threatened by the Gulf oil spill. Page 14.

Brown Pelican - Pelecanus occidentalis
The brown pelican is one of the birds threatened by the Gulf oil spill. Page 13.

Brown Pelican - Pelecanus occidentalis
The brown pelican is one of the birds threatened by the Gulf oil spill. Page 18.

Clapper Rail - Rallus longirostris
The clapper rail is one of the birds threatened by the Gulf oil spill. Page 12.

Great Egret - Ardea alba
The great egret is one of the birds threatened by the Gulf oil spill. Page 11.

Laughing Gull - Larus atricilla
The laughing gull is one of the birds threatened by the Gulf oil spill. Page 10.

Mottled Duck - Anas fulvigula
The mottled duck is one of the birds threatened by the Gulf oil spill. Page 9.

Reddish Egret - Egretta rufescens
The reddish egret is one of the birds threatened by the Gulf oil spill. Page 8.

Reddish Egret - Egretta rufescens
The reddish egret is one of the birds threatened by the Gulf oil spill. Page 7.

Roseate Spoonbill - Platalea ajaja
The roseate spoonbill is one of the birds threatened by the Gulf oil spill. Page 6.

Roseate Spoonbill - Platalea ajaja
The roseate spoonbill is one of the birds threatened by the Gulf oil spill. Page 5.

Royal Tern - Sterna maxima
The royal tern is one of the birds threatened by the Gulf oil spill. Page 4.

Snowy Egret - Egretta thula
The snowy egret is one of the birds threatened by the Gulf oil spill. Page 17.

Snowy Plover - Charadrius alexandrinus
Snowy plovers are small plovers that are distinguished by the white collar of feathers that circles their neck as well as by the dark patches on their shoulders which do not connect to form a breast band as in the Wilson's plover. Page 3.

Wilson's Plover - Charadrius wilsonia
The Wilson's plover is one of the birds threatened by the Gulf oil spill. Page 2.

Wildlife Conservation Society
The Wildlife Conservation Society supports zoos and aquariums while promoting environmental education and conservation of wildlife and habitats.

Grassland Biome - The Habitat Encyclopedia
The grassland biome is a terrestrial biome with a vegetation structure that is dominated by grasses and that is largely void of trees or shrubs.

Photo-Monitoring Nigaloo's Whale Sharks
Whale sharks are anything but camera shy. From 1995 to 2006, scientists, tourists, and divers took more than 5100 photographs of these gentle giants.

10 Facts About Fishes
Learn interesting facts about fishes and find out about their diversity, evolutionary history and the characteristics make them different from other animal groups.

Insectivores - Insectivora - The Animal Encyclopedia
Insectivores are a group of mammals that include hedgehogs, moonrats, shrews, and moles. Insectivores are generally small mammals with nocturnal habits.

Hedgehogs - Erinaceidae - The Animal Encyclopedia
Hedgehogs are a group of insectivores that includes seventeen species. Hedgehogs are small mammals with a rotund body shape and distinct spines made of keratin.

Woodpeckers - Piciformes - The Animal Encyclopedia
Woodpeckers and their relatives are a group of arboreal insectivorous birds that include close to 400 species.

The Sponge Loop: Or How to Power a Coral Reef
In 1842, about seventeen years before the publication of On the Origin of Species, Charles Darwin completed a monograph about coral reefs.

How Tetrapods Made The Transition to Life On Land
During the Devonian Period, about 375 million years ago, a group of vertebrates clamoured their way out of the water and onto land.

Vipers - Viperidae - The Animal Encyclopedia
Vipers are a group of snakes that include true vipers, bush vipers, rattlesnakes, pit vipers, adders and night adders.

Vestigial
A part of an animal that is no longer used and is, from an evolutionary perspective, in the process of being lost.

10 Facts About Carnivores
Canids are long-legged carnivores that include wolves, coyotes, jackals, foxes, wild dogs and domestic dogs.

Creating a Wildlife Journal
Read how you can start keeping a journal to record your observations of animals and wildlife.

Bearded Gobies to the Rescue
The bearded goby is an ecological superhero. In less than five decades, this six-inch fish managed to revive an entire marine ecosystem, one that had careened to the brink of collapse.

Feather - Feather Anatomy and Function
Feathers are a unique adaptation of birds. Feathers are made up of keratin, an insoluble protein that is also found in mammalian hair and reptilian scales.

Desert Biome - The Habitat Encyclopedia
The desert biome covers one-fifth of the earth's surface and includes habitats that receive very little rainfall each year.

The Decline of Uganda's Lions
New research has been published that adds to those concerns and further brings into question the future of lions in Africa.

Great Barrier Reef Predators
Predators on the reef come in many shapes and sizes and include tiger sharks, reef sharks, whale sharks, manta rays, lobsters, and octopus.

What Is Sexual Dimorphism?
Sexual dimorphism is the difference in form between male and female members of the same species.

Ernst Haeckel
Ernst Haeckel was a physician, anatomist, zoologist, naturalist, biologist and artist well know for his law of recapitulation.

Great Barrier Reef
The Great Barrier Reef is the largest coral reef in the world. It is located off the shores of eastern Australia from Bamaga to Bundaberg, Queensland.

The Wildlife of Africa
Africa is the second largest continent, it is smaller than only Asia, and home to a extraordinary variety of habitats and wildlife.

10 Facts About Zebras
Facts about zebras, a group of equids with a distinct black and white striping pattern.

Reptile Characteristics - The Animal Encyclopedia
Explore the basic characteristics that are shared by all reptiles—from snakes and lizards to crocodiles and turtles.

The Nature Conservancy
The Nature Conservancy is a conservation group that works with governments, communities, and others to solve conservation challenges.

10 Facts About Invertebrates
Learn interesting facts about invertebrates, a group of animals that accounts for 97 percent of all known species.

About Elephants' Trunks
Elephants' trunks are muscular, flexible extensions of their upper lip and nose. To drink, elephants suck water up into their trunk

Finding Their Way: Understanding Whooping Crane Migration
Recently, a team of scientists led by Thomas Mueller from the University of Maryland analyzed 8 years of data on migratory whooping cranes.

Birds of Prey - Falconiformes - The Animal Encyclopedia
Birds of prey also known as raptors, are formidable avian predators, armed with powerful talons, hooked bills and acute eyesight.

The Wildlife of South America
South America is home to the world's largest tropical rainforest, the Amazon rainforest. The Amazon is home to a staggering diversity of plant and animal species.

Crocodilians - Crocodilia - The Animal Encyclopedia
Crocodilians are a group of large reptiles that includes crocodiles, alligators, caimans, and the gharial.

Magombera Chameleon - Kinyongia magomberae
Meet the Magombera chameleon, aka Kinyongia magomberae, a small chameleon with a long tail and a delicate spattering of colors.

Myriapods - Myriapoda - The Animal Encyclopedia
Myriapods are a group of arthropods that includes millipedes, centipedes, pauropods, and symphylans. Myriapods are noted for their having many legs.

Waterfowl - Anseriformes - The Animal Encyclopedia
Waterfowl are a group of birds that live in a variety of freshwater habitats. Waterfowl include screamers, ducks, geese and swans.

Working with Animals - Jobs and Careers Working with Animals
If your interest in animals has inspired you to pursue a career working with wildlife, then the articles and tips included here should help you as you find the right job for you. Working with animals can be extremely rewarding and there are many opportunities from full time jobs to volunteer positions.

Conservation Topics
Wildlife conservation operates at many levels—some efforts aim to help a single population or species, while others attempt to set entire communities or ecosystems back on track. Regardless of scale, wildlife conservation often hits the headlines as the articles listed here reflect.

Habitat Restoration & Protection
Efforts to restore and protect endangered habitats often results in the conservation of numerous animal species and the interactions those species form. The articles here focus on initiatives and achievements in the area of habitat conservation.

Endangered Cats
Many species of cats around the world are critically endangered due to habitat destruction, hunting, and decline of their prey base. The articles that follow examine the causes of decline in cat populations and what conservationists are doing to save rare panthers and their relatives.

The Whaling Controversy
In 1986, a moratorium on whale hunting was initiated by the International Whale Commission. Despite the widespread international outcry to halt the commercial killing of whales, three nations—Japan, Iceland and Norway—continue to slaughter whales without regard for IWC regulations or the long-term viability of whale populations.

New Species - Discoveries of New Species
Scientists can only estimate the number of species that share planet Earth with us and new species are discovered all the time.

Amphibian Declines
In recent years, scientists have been working to raise awareness of a global decline in amphibian populations. Their message is alarming: of 5,918 known species of amphibians, a staggering 1,856 are listed as threatened.

Endangered Species - Facts About Endangered Species
The increased extinction rates of animals during recent decades is alarming. A closer look at threatened and endangered animals yields a wealth of warnings and possible solutions to our current biodiversity crisis.

Earth Day
April 22 is Earth Day, an event that encourages people around the world to learn about environmental issues, reduce the impact humans have on the environment, and aleviate threats to natural areas and wildlife. Earth Day has inspired the Clean Air Act, Clean Water Act, Endangered Species Act and the establishment of the Environmental Protection Agency.

Wolf Protection
Wolves are among a number of predator species that have been targeted by humans because they sometimes resort to the killing of livestock. Such persecution has led to widespread decline or elimination of the species from many areas of its former range. But now despite controversy, conservation efforts are bringing the wolf back to the wild.

Readers Wildlife Photo Gallery - Bird
This photograph of a bird was submitted to the Reader's Wildlife Photo Gallery by Amit Ray. Page 5.

Readers Wildlife Photo Gallery - Bird
This photograph of a bird was submitted to the Reader's Wildlife Photo Gallery by Katy Baxter. Page 2.