The hermit crab is a small crustacean known for its unique habit of using empty shells for protection. Unlike true crabs, hermit crabs have soft abdomens that they need to shield from predators. They often inhabit shells from snails and will switch shells as they grow, seeking larger ones to accommodate their size. Hermit crabs are social creatures and can often be found in groups. They are primarily scavengers, feeding on decaying plant and animal matter. These crabs are commonly kept as pets, requiring a suitable habitat with humidity and temperature control to thrive.