'Racing Extinction' sounds the alarm on Earth's disappearing species

10 national animals that are rare, unusual, endangered or completely nonexistent

An intimate look at Yellowstone's most famous grizzly mama

Puma returns to rain forest after 20 years in chains

Bid farewell to Nola, one of the last northern white rhinos on Earth

Tennessee town awakens to spider invasion

Microscopic parasite is actually a tiny jellyfish, scientists discover

This weasel's name changes with the seasons

Weird sea mollusk has eyes made of armor

World's weirdest slug is shaped like a fish and glows in the dark

U.S. puts an end to all experiments on chimps

How to speak panda