
Hermit crabs are decapod crustaceans of the superfamily Paguroidea. Most species have long, spirally curved abdomens, which are soft. The vulnerable abdomen is protected from predators by a salvaged empty seashell carried by the hermit crab. Most frequently, hermit crabs use the shells of sea snails. Most species are aquatic and live in varying depths of salt water, from shallow reefs and shorelines to deep sea bottoms. Most hermit crabs are nocturnal. *Wiki