As part of the unique, science Know-It-Alls! Series that features stunning covers and engaging text, this book puts the spotlight on Apes! Did you know that orangutans spend most of their lives in trees? They are the slowest-moving apes. Big males sometimes have to travel on the ground because the tree branches can’t support them. Children will learn about the gorilla, chimpanzee, orangutan, bonobo and gibbon.