Millions of animals are at risk, but what are the rarest animals in the world? These are some of the most endangered animals, ...

New research reignites debate over the size of this extinct giant, also suggesting it looked unlike a great white ...

Colombian marine biologist Fernando Trujillo has spent a lifetime working with the endangered creatures, which offer a window ...

Reasons for the beachings are unclear. The endangered dolphins, which can grow up to 20 feet (6.1 m) long and weigh up to 3,000 lbs (1,361 kg), resemble killer whales. They are found in all ...

Reduced to just a few thousand, Hector's dolphins are being decimated by fisheries bycatch Behold the World's Smallest Monkey: The Pygmy Marmoset (02:17) National Treasure: The Giant Panda Steals ...