In order to be classified as a mammal, animals must have fur or hair, be warm-blooded, and mothers must give birth to live young. In this specially formatted book, readers learn about this animal group as well as many example of mammal species. Full-color photographs illustrate interesting body adaptations of each animal, first in close-up, along with facts about the animal that might clue readers in to what it is. The next pages reveal the whole animal and much more fun science information about it.