Hermit Crab

These crabs live both in water and on land. In water, they mainly live in muddy and sandy-bottomed marine water and on land, they even live in holes in trees or under rock ledges. Some can be found in salt marshes or coastal areas as they look for food in those places. In households, the hermit crabs are kept as pets and they are kept in aquariums. Some hermit crabs who can live both on land and water live inside plant stems, bamboos, or in coconut shells. Some aquatic ones, the ones who live in water, can be found living inside coral, hollow wood, or sponges.

They are not true crabs as they don't really grow their own shells on their body like other types of crabs.

Most of the hermit crabs take the empty shells left behind by snails and others to protect themselves from predators as they don't have any outer protection in their abdominal area. This is the reason they are called hermits. Their crab-like features are the reason they are called crabs.