Scientists have found one of the world's rarest chameleons again after fearing the species was extinct due to shrinking forests.
Scientists discovered cracked tail vertebrae and a large, bony foot tumor in the fossil skeleton of a dinosaur that lived during the Cretaceous.
Researchers have uncovered a 310 million-year-old horseshoe crab fossil complete with an exceptionally rare example of a fossilized brain.
Polar bears are the largest bear species and are supremely adapted to their Arctic habitat, whether they are prowling the ice or swimming in the sea.
Scientists discovered a fossil graveyard of thousands of perfectly preserved starfish, sea cucumbers, sea lilies and other invertebrates in a UK quarry likened to a 'Jurassic Pompeii'.
Fossils from northwestern Canada may represent ancient sponges dating to 890 million years ago, making them the oldest known examples of animal life.
Whale watchers in Japan recently saw a pair of white orcas swimming side by side in a pod off the coast of Hokkaido.
Big cats are found all over the world, from Alaska to China, and each one is ferociously unique. Here are the nine biggest cats alive today.
Acclaimed horror director Eli Roth has a new documentary on a horrific subject: the shark finning trade.
Researchers have documented chimpanzees killing gorillas for the first time. The two fatal attacks were caught on film at a national park in Gabon, Central Africa.
Wild cockatoos have figured out how to open garbage can lids, and the practice is spreading due to social learning.
A near-complete fossil skeleton of an ancient reptile dates to 300 million years ago. It had a blunt skull for tunneling underground, and special scales may have helped it slither through dirt.
With their bright orange hues and lengthy migration, monarch butterflies are one of the world's most iconic insects.
A 100-pound opah fish, also known as a moonfish, was recently found washed up on a beach in Oregon hundreds of miles from its normal habitat.
Pikas eat yak poop to help them survive winters at high altitudes on the Qinghai-Tibetan Plateau in Asia.
Here's a look at the gruesome ways pythons take down their prey, from rats and mice to spotted deer and crocodiles. See photos of the snakes in action.
Ask any shark biologist a question about sharks, and chances are, the answer might begin with, "We're not really sure…"
A photographer created an astonishing time-lapse video from aerial footage of sheep as they traveled between pastures over seven months.