Mammals - Blue Zoo Guides Author:Dee Phillips The Blue Zoo Guides are perfect for the young animal-lover that is eager for more, more, more! Each of these big blue books uses close-up photos, simple text and charming illustrations to introduce over 40 types of critters.n Introductions define what makes a mammal a mammal, and how an insect differs from spiders and other invertebrates.n... more » Comparative illustrations or life-size photos help to convey the actual size of each animal.n Bolded words are defined in the glossary.« less