See all the challenges! A mission to help save animals (AD) Check out the book! Help save wolves. African Elephant LARGE AND IN CHARGE GRAY WOLF These wild dogs like to play! Lion SAVANNA KING Polar Bear ADAPTED TO THE COLD Meet the Mammals! They're warm-blooded and hairy. Check out pictures, videos, and facts. Watch on YouTube! Play all the videos! Watch on Roku! Play all the videos! Support Our Work Learn how your donations can help endangered species. Watch Nat Geo Kids TV! Get a sneak peek of the shows. (AD) GET THE BOOKS. Save animals, save the world!