Animal Quick Links Find animals by type. (ad) Buy the Almanac! Get your hands on a copy. Watch more videos! Visit Nat Geo Kids on YouTube. Mammals Get facts, videos, and photos. Watch on Roku! Play all the videos! Is your dog a genius? More Cool Videos! Check out all the YouTube playlists. African Elephant Check out facts, photos, and videos. Cheetah Fastest land mammal Lion See why these big cats rule. Black RHINO Get facts and photos. GRAY WOLF These wild dogs like to play! MOUNTAIN GORILLA The biggest male takes charge. BLUE WHALE THE EARTH'S LARGEST ANIMAL HIPPOPOTAMUS They're amazing swimmers. Polar Bear They're strong swimmers. Bottlenose Dolphin They communicate with clicks. KANGAROO CAN LEAP 30 FEET! Raccoon They really love garbage. Research Reptiles! Get facts and watch videos about these cold-blooded creatures. GILA MONSTER EATS ONCE A YEAR! NILE CROCODILE ARMORED TANK King Cobra A snake with bite! BOA CONSTRICTOR SQUEEZE PREY Hairy Frogfish Spines help this fish hide. Stingray Their tails have venom! Red-Bellied Piranha Mean—or just misunderstood? Seahorse LOOKS LIKE A TINY HORSE! Find out about Fish! Watch videos, see pictures, and get facts.