Did you know that blue whales are the largest animals in the world? Or that gorillas talk to each other with sounds, smiles, and frowns, just like humans? The world is filled with millions of animal species, and all of them are special. But many are in danger. In this book, Chelsea Clinton introduces the youngest of readers to a selection of endangered animals, sharing what makes them special. With gentle facts about each animal, warm and engaging art by Gianna Marino, and a heartfelt refrain of "Don't let them disappear!" this book is the perfect read for baby and toddler animal-lovers and anyone who cares about our planet.