Find out what a boa constrictor has in common with an American crocodile. Discover what sets a boa constrictor apart from a green iguana. Readers will compare and contrast key traits of boa constrictors-their appearance, behavior, habitat, and life cycle-to similar and different reptiles. Charts and sidebars support key ideas and provide details. Through gathering information about similarities and differences, readers will make connections and draw conclusions about what makes this animal a reptile and how reptiles are alike and different from each other.