Pill bugs belong to terrestrial crustacean group and have been placed in the order Isopoda. The name of their class is Crustacea. Pill bugs are crustaceans rather than an insect. Crustaceans are animals which contain hard shells partitioned into many pieces. Few other crustaceans of its class include shrimp, crabs, and water fleas or daphnia. Pill bugs are also sometimes known as Rolly Polly because of their unique feature. Here, in this article, we will discuss primary details about pill bugs regarding their appearance, reproduction, habitats, and other fascinating facts.