Humpback Whales: Musical Migrating Mammals

Platypuses: Web-Footed Billed Mammals

Platypuses: Web-Footed Billed Mammals

African Elephants: Massive Tusked Mammals

Grizzly Bears: Huge Hibernating Mammals

Vampire Bats: Nighttime Flying Mammals

African Elephants: Massive Tusked Mammals

Grizzly Bears: Huge Hibernating Mammals

Thousand-Mile Fliers and Other Amazing Migrators

Trap-Door Spiders and Other Amazing Predators

Leatherback Sea Turtles: Ancient Swimming Reptiles

Gray Wolves: Howling Pack Mammals

Mountain Gorillas: Powerful Forest Mammals

Gray Wolves: Howling Pack Mammals

Mountain Gorillas: Powerful Forest Mammals

Snowy Owls: Stealthy Hunting Birds

Ruby-Throated Hummingbirds: Tiny Hovering Birds

Siberian Tigers: Camouflaged Hunting Mammals

Siberian Tigers: Camouflaged Hunting Mammals

Night Creatures: Animals That Swoop, Crawl, and Creep while You Sleep