Shane P. White / Coconut Crab (Birgus latro) on palm tree, Espiritu Santo, Vanuatu

Shane Gross / Caribbean hermit crab (Coenobita clypeatus) using an empty conch shell for protection and housing. Eleuthera, Bahamas.

Claudio Contreras / Staghorn hermit crab (Manucomplanus varians) and Staghorned Hydrocoral (Janaria mirabilis), mutualist species, Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, Jul...

Jen Guyton / Hermit crab (Coenobita clypeatus) near Cahuita, Costa Rica.

MYN / Sheri Mandel / Blueband hermit crab (Pagurus samuelis), Malibu, California, USA, February, meetyourneighbours.net project

Claudio Contreras / Land Hermit Crab (Coenobita compressus) in nerita snail (Nerita sp.) shell, Maria Cleofas Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Shane P. White / Coconut Crab (Birgus latro) on palm tree, Espiritu Santo, Vanuatu

Joel Sartore / Photo Ark / Hairy hermit crab (Pagurus hirsutiusculus) portrait, East Bay Regional Parks Mobile Education Program. Captive, from San Francisco Bay, California, USA.

Pascal Kobeh / Cuban rock iguanas (Cyclura nubila) and Caribbean hermit crabs (Coenobita clypeatus) on the beach with a Desmarest's hutia (Capromys pilorides), a species of rodent, in the background, Gardens of...

Karine Aigner / Caribbean hermit crab (Coenobita clypeatus) emerging from its shell, on a white background, Belize.

Karine Aigner / Caribbean hermit crab (Coenobita clypeatus) hiding in its shell, on a white background, Belize.

Karine Aigner / Caribbean hermit crab (Coenobita clypeatus) on white background, Belize.