Hermit crabs are small crabs that carry shells on their backs, both for a home and for safety. But with shells being harder to find year after year, hermit crabs have had to spend more time in shells ...

Abrams, Peter A. 1981. "Shell fighting and competition between two hermit crab species in Panama." Oecologia, 51, (1) 84–90.

Japanese researchers have described a new species of sea anemone that appears to share a mutually beneficial relationship with hermit crabs. The pale pink sea anemones, now named Paracalliactis ...