Roly polies, also known as pill bugs or woodlouses, may look like insects, but they are not. They are actually land-dwelling crustaceans, also known as isopods, and are related to crabs, lobsters, and shrimp. But what do roly polies and kangaroos have in common? Both carry their homes on their bodies. Roly polies curl up into a ball for protection, while kangaroos carry their babies in their pouches. This shows that both animals have developed special ways to protect their young.