Lundgren 
Skeletons and Exoskeletons [PDF ebook] 

This Title Explains How Humans And Animals Have A Skeleton To Support The Inner Workings Of Their Bodies And How The Muscle Attached To The Skeleton Helps Us Move. Also Explains How Exoskeletons Have A Skeleton On The Outside Of Their Bodies, Giving Examples Of Insects Such As Ants. Endoskeletons Are Also Exampled. Gives Detailed Information On Each, Along With Their Habitats, Eating Habits, And Ways They Adapt To Survive. A Special Section Called, "Explore Your World" Outlines An Experiment That Allows Them To Identify And Examine First-Hand This Intriguing Topic.