What Is a Bird? (Animal Kingdom)
	What Is an Amphibian? (Animal Kingdom)
	What Is a Fish? (Animal Kingdom)
	What Is a Mammal? (The Animal Kingdom)
	What Is a Reptile? (Animal Kingdom)
	Animal Classification: A Guide to Vertebrates
	Animals With Backbones (Kid's Guide to the Classification of Living Things)
	e.Encyclopedia Animal
	Classification of Animals (Sci-Hi)
	Disney Learning: Wonderful World of Animals
	The Animal Kingdom (Classification)
	Nematodes, Leeches, & Other Worms (Animal Kingdom Classification)
	Tree Frogs, Mud Puppies, and Other Amphibians (Animal Kingdom Classification series)
	Encyclopedia of Animals
	First Animal Encyclopedia (Dk First Reference Series)
	National Geographic Encyclopedia of Animals
	Visual Encyclopedia of Animals
	Animal Variation and Classification (Living Processes)
	One Million Things: Animal Life
	My Big Animal World Book (My Big Reference)