Did you ever wonder why a crocodile is not an alligator or why a bat is not a bird? This slim, informative book adequately answers those questions as well as 12 additional ones about other similar but different animal pairs. The physical characteristics of each animal are accurately compared and contrasted with those of its counterpart. Full-color realistic illustrations of each animal accompany the readable text. This interesting, factual book presents curious young animal detectives with the basic methods of observation to identify differences and similarities in animals they regularly encounter.