Learn what a mountain gorilla has in common with a hippopotamus. Find out what sets a mountain gorilla apart from a raccoon or a mountain lion. Readers will compare key traits of mountain gorillas—their appearance, behavior, habitat, and life cycle—to traits of other mammals. 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 mammal and how mammals are alike and different from each other.