Hermit crabs are not the only crustacean that takes another animal’s shell for its own. This behaviour isn’t even particularly rare, technically; several species of assassin bugs decorate their spiky bodies with the remains of their prey and octopuses use whatever they can find, including discarded shells, as mobile shelters. One crustacean, however, takes its borrowed shell one step farther, and that is Phronima sedentaria, the barrel shrimp.
