Roly-Poly Pillbugs (No Backbone! the World of Invertebrates)

How did the pillbug get its name? In order to defend itself from predators, this little critter can roll itself up into a tight ball the shape of a pill! The hard plates on its body work like armor to protect its soft underside from predators. These are just some of the fascinating facts children will discover as they explore the strange and unusual world of this creepy crawler.