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An animal or plant becomes extinct when the last of its kind dies. 
Story

Take a look at some unusual living and extinct mammals.
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Why are many animal and plant species dying out forever?
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This butterfly once lived in the mangrove forests along the tropical coast of Taiwan.
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Thousands of plants and animal species may be in danger of becoming extinct and disappearing forever.
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Its brow horns and snout horn inspired this dinosaur's name, which means "three-horned face."
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Ross MacPhee has always loved dirt. It means the opportunity to find lost things--from bones and teeth to pirate trea...
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This extinct bird weighed over 330 pounds and had heavy legs and tiny wings. 
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Earth was a very different place at the beginning of the Triassic. All of Earth's continents were combined into one s...
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Although extinct today, this gopher-sized mammal thrived during the Mesozoic Era for about two million years.
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An invasive species is a living thing that moves into a new region. Species often become "invasive" as a re...
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The Sumatran tiger is found in only one place on the Earth -- on the island of Sumatra in Indonesia. Fewer than 500 o...
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The Asian elephant is one of the largest land mammals in the world. Some people believe that elephants feel joy and s...
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This prehistoric relative of living ducks had a long neck, tall legs, webbed feet, and a duck-like head.
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With its furry coat, friendly face, and playful nature, the sea otter is perhaps one of the most endearing animals in...
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Fossils are the key to understanding life in the past.
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For centuries, orange roughy went mostly unnoticed by humans. These fish thrived in the dark, the cold, and the inten...
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You could travel the globe, but there's only one place you'd find a ruffed lemur: Madagascar. It is an endemic specie...
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According to legend, the roc was a giant bird large and strong enough to carry an elephant in its claws. As incredibl...
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Some volcanoes erupt explosively, like opening a shaken soda bottle, because their magma is full of gases.
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This plant-eating dinosaur might have weighed as much as 225 kilograms (500 pounds)!
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Long before dinosaurs, these strange roach-like creatures scurried along the ancient sea floor.
Hands-on

Send a note to a friend with these colorful letterheads.
Game

Play this game to find out how a law protects animals and plants.
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This mighty member of the cat family is a powerful predator. It can leap up to 30 feet in the air, climb trees, and e...
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As a kid, John Flynn had a rock collection and made lots of trips with his family and school to the American Museum o...
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At age 10, George Barrowclough began bird watching with his dad. He pursued his interest in birds by becoming an orni...
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One look at Redondasaurus, and you might think it's a crocodile. After all, it has a similar long, armored body, with...
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The whooping crane is known as the tallest bird in North America. This long legged creature has been struggling to su...
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The rare Taiwan beech tree grows only in a few forests of northern Taiwan. These are also the only places you'll find...
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Chris Raxworthy has been fascinated by all things scaly and slimy since he was a kid. Chris is a herpetologist at the...
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His love of natural sciences and extreme camping led this scientist to paleontology.
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The snowy egret is a beautiful sight. An adult egret is distinguished by its dark slender beak, long black legs, and...
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In 1938, fishermen off the east coast of Africa pulled up a strange creature in their nets.
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These creatures have lived in Earth's oceans for over 545 million years!
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The first vertebrates to fly took to the skies about 215 million years ago. These creatures were neither birds nor ba...
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Throughout history, many cultures have told of mythic creatures of enormous size. The cyclopes are some of the most f...
Hands-on

Invent a story about an endangered species. Then draw and write about it!
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Many mammals run and walk. Some hop, swim, and even glide from trees.
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The red kangaroo is an amazing mammal. With its powerful hind legs and long tail, it can leap up to 45 feet (13.5 m)...
Story

Take a world-wide tour of biodiversity with three scientists.
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How far have your groceries traveled? Find out!
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Bubbling hot springs. Antarctic ice. Deep ocean trenches. The Himalayan peaks. Few organisms can live in any of these...
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Manatees were once mistaken for mermaids. In fact, manatees are part of a small group of marine mammals known as &quo...
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Compared to the continent of Africa, Madagascar may seem small. But this island, the fourth largest in the world, is...
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The gremlin-like, endangered aye-aye makes its home in the tropical forests of Madagascar, a large island off the coa...
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California condors are the largest birds in North America. Like all vultures, condors are carrion-eaters. This means...
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As a conservation geneticist, Yael tries to help endangered species by studying their DNA.
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In the wild, ruffed lemurs live in only one place -- the eastern rain forests of Madagascar.
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Growing up, Joel Cracraft loved reading travel and adventure books. In high school, he became interested in ornitholo...
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Many famous dinosaurs, such as T. rex and Triceratops, first appeared in the Cretaceous Period.
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The name Jurassic conjures images of tremendous dinosaurs roaming the Earth.
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Ornithologists, or scientists who study birds, want to prevent the forests of the Pacific Northwest from being choppe...
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The mountain gorilla lives high up in the forests of east central Africa.
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New Caledonia, a tiny island east of Australia, is the only place where an unusual bird called the kagu is found. Abo...
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In Japan, a frightening water creature called the kappa was long known for pulling children underwater and drowning t...
Video

Ross MacPhee has always loved dirt. To him it means the opportunity to find lost things — from bones and teeth to pirate treasure.
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If you came face to face with a pacu, what would you do? Never fear -- the pacu may look like a big and scary fish, b...
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This is one of the oldest known dinosaurs!
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This horned dinosaur had two long spikes on the back of its frill, the bony extension behind its skull.
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The striped bass has been a popular catch for fishermen for centuries. These fishes are known for their spiny fins an...
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When Paula Mikkelsen moved to Florida, she turned a fun hobby into an exciting career. She enjoyed walking along Flor...
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About 80 million years ago, the carnivorous Velociraptor and the plant eating Protoceratops fought to the death.
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Paleontologists uncovered this just-hatched Protoceratops in 1997 at Ukhaa Tolgod.
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California sea lions are playful, intelligent, and fast—in and out of water. Their large flippers enable them to leap...
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Since he was a boy, Vladimir Ovtsharenko has been fascinated by nature. Growing up, he loved collecting spiders, beet...
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Confuciusornis is the earliest-known toothless, beaked bird.
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For thousands of years, the dragon has been an unmistakable symbol around the world. But this lizard-like beast doesn...
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About 120 kilometers (75 miles) off the coast of China is the island of Taiwan. Although this country is small, it is...
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The dazzling Magellan's Iridescent Birdwing is found only on Orchid Island, about 60 kilometers off the southeast coa...
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The leatherback is the world's largest turtle. Unlike the bony exterior of other sea turtles, the exterior of the lea...
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This beautiful tortoise lives in the deserts of Madagascar, an island off the coast of Africa. This reptile gets its...
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The St. Vincent parrot makes its home on the tropical island of St. Vincent in the Caribbean. These parrots are cover...
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The Tibetan antelope, also known as "chiru," is one of the most beautiful mammals in the world.
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Join the inquisitive Deena Soris as she interviews the fossil of a Protoceratops. 
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This large dark bird is unmistakable soaring in the air along the coast.
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What do we have in common with sharks, bluebirds, lizards, and toads? We are all vertebrates, or animals with backbon...
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Not all spiders spin webs to catch their meals. When night falls in Australia, the white-tailed spider hunts its prey...