David Shale / Deepsea Hermit crab with zoanthid (Epizoanthus sp) on shell, from a coral seamount in the Indian Ocean, November 2011

Juergen Freund / Land Hermit crab using a plastic bottle cap as its home. Kavieng, Papua New Guinea, June 2010

Juergen Freund / Hermit crab with shell covered in soft coral (Heteroxenia fuscescens) Lembeh Strait, North Sulawesi, Indonesia

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) colony in Hump Coral (Porites sp), Solomon Islands

Chris Newbert / Hermit Crab (Paguritta gracilipes) in Hump Coral (Porites sp) 30 feet deep, Solomon Islands

Alex Mustard / Portrait of Morgan's coral hermit crab (Paguritta morgani) looking out of its burrow in a hard coral colony. These hermit crabs are sedentary, remaining in their burrows, rather than carrying arou...

Pascal Kobeh / Coral hermit crab (Paguritta / Orthopagurus harmsi), Sulu sea, Philippines

Pascal Kobeh / Coral hermit crab (Dardanus pedunculatus) with sea anemones on its shell - the anemones get better feeding opportunities from extra mobility, the crab gains extra protection. Sulu Sea, Philippines.

Pascal Kobeh / Coral hermit crab (Dardanus pedunculatus) with sea anemones on its shell - the anemones get better feeding opportunities from extra mobility, the crab gains extra protection. Sulu Sea, Philippines. Me...

David Fleetham / White spotted hermit crab (Dardanus megistos) amongst coral. Kauai, Hawaii.

David Fleetham / Coral hermit crab (Paguritta sp) in coral home, Yap, Micronesia. Small repro only

Alex Mustard / Morgan's coral hermit crab (Paguritta morgani) looks out from its hole, surrounded by an orange sponge with zooanthids. Arborek jetty, Arborek Island, Raja Ampat, West Papua, Indonesia. Dampier Strait...

Tony Wu / Paguritta coral hermit crabs (Paguritta sp) looking out from burrows in coral, Papua New Guinea

Pascal Kobeh / Coral hermit crab (Dardanus pedunculatus) with sea anemones on shell, Sulu Sea, Philippines

Pascal Kobeh / Coral hermit crab (Dardanus pedunculatus) with sea anemones on shell, Sulu Sea, Philippines

Aflo / Krausii / coral hermit crab (Paguritta vittata) in hole, Miyako, Okinawa, Japan, May.

Aflo / Krausii / coral hermit crab (Paguritta vittata) in hole, Miyako, Okinawa, Japan, May.

Aflo / Krausii / coral hermit crab (Paguritta vittata) in hole, Kume Island, Okinawa, Japan. December.

Claudio Contreras / White-spotted Hermit Crab (Dardanus megistos), Batasan Island, Danajon Bank, Central Visayas, Philippines, April

David Shale / Hermit crab with anemone. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Hermit crab with anemone. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Hermit crab with anemone. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Deepsea Hermit crab (Paguroidea) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

Alex Mustard / Bareye hermit crab (Dardanus fucosus) makes its home in a conch shell as it crawls over the sand, West Palm Beach, Gulf Stream, West Atlantic Ocean, Florida, USA.

Alex Mustard / Stareye hermit crab (Dardanus venosus) in a canyon on a coral reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

David Shale / Deepsea Hermit crab with zoanthid (Epizoanthus sp) on shell, from a coral seamount in the Indian Ocean, November 2011

Jeff Rotman / Hairy hermit crab (Aniculus elegans) camouflaged on coral reef, Tagus Cove, Galapagos Islands, Pacific Ocean.

Brent Stephenson / Strawberry Hermit Crab (Coenobita perlatus) walking over coral rubble. Takutea, Cook Islands, November.

Juergen Freund / Coconut crab (Birgus latro) climing along root in rainforest, Tetepare Island, Solomon Islands, South Pacific.

Birgitte Wilms / Hermit Crab (Paguritta gracilipes) in hard coral, Solomon Islands

Juergen Freund / Anemone hermit crab (Dardanus pedunculatus) with anemone on its shell, walking on the sandy sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Hermit crab walking over seabed leaving tracks in the sand, Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Coconut crab (Birgus latro) in a burrow in the forest of Tetepare Island, Western Province, Solomon Islands, Melanesia, July 2010 . NOT AVAILABLE FOR MAGAZINE USE IN GERMAN-SPEAKING COUNTRIES UNTI...

Juergen Freund / Anemone hermit cab (Dardanus pedunculatus) with several anemones on its shell. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Hermit crab (Dardanus megistos) on sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Red hermit crab (Dardanus megistos) on sandy bottom. Lembeh Strait, Sulawesi, Indonesia

JEFF FOOTT / Colony of Coral hermit crabs (Paguritta sp) about 1cm in size, Vanuatu, Pacific Islands.

Pete Oxford / Giant Hermit (Petrochirus diogenes) on sandy ocean floor, Belize Barrier Reef, Belize

Juergen Freund / Hermit crab {Paguroidea} Great Barrier Reef, Australia

David Shale / Hermit crab in piece of coral, Barents sea, Northern Europe

David Shale / Hermit crab in piece of coral, Barents sea, Northern Europe

Constantinos Petrinos / Hermit crab {Dardanus lagopodes} on coral reef, Sulawesi, Indonesia

Juergen Freund / Hermit crab on soft coral (Paguridae) Pacific Canada

Rod Williams / Land hermit crab on coral C {Coenobita clypeatus} West Indie

Steven David Miller / Hermit crab, Lady Elliot Is, Australia

Birgitte Wilms / Coral Hermit Crab (Paguritta harmsi) portrait, 40 feet deep, Solomon Islands

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep Solomon Islands

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep, Solomon Islands

Chris Newbert / Left-handed Hermit Crab (Paguristes sp) peering out from a vacated Serpulid Worm hole in the reef surrounded by a Red Encrusting Sponge, Solomon Islands

Chris Newbert / Christmas Tree Worm (Spirobranchus giganteus) and Coral Hermit Crab (Paguritta harmsi) colony, Solomon Islands

Constantinos Petrinos / Large hermit crab {Dardanus lagopodes} Sulawesi, Indonesia

Constantinos Petrinos / Large hermit crab {Dardanus megistos} Sulawesi, Indonesia

Jeff Rotman / Hairy hermit crab {Aniculus elegans} camouflaged on coral reef at night, Galapagos

Roberto Rinaldi / Hermit crab (aniculus maximus) in its shell, Palau, Micronesia.

David Hall / Coral hermit crabs in coral. (Paguritta spp) Fiji

David Fleetham / Hairy netted hermit crab (Aniculus retipes) resting on coral reef, Yap, Federated States of Micronesia, Pacific Ocean.

Alex Mustard / Coral hermit crab (Paguritta sp.) peering out from its hole in a coral reef, Bitung, North Sulawesi, Indonesia, Lembeh Strait.

David Fleetham / Cone shell hermit crab (Ciliopagurus strigatus) inhabiting a cone shell, Hawaii, Pacific Ocean. Crab has a specialized flat body that allows it to squeeze into the narrow opening of the shell.

Alex Mustard / Coral hermit crab (Paguritta harmsi) peering out from a hole in hard coral on a reef, Laamu Atoll, Maldives, Indian Ocean.

David Fleetham / Coral hermit crab (Paguritta vittata) living in hole in hard coral, traps passing plankton in its feathery antennae, Yap, Federated States of Micronesia.

David Fleetham / Close up of a Hairy yellow hermit crab (Aniculus maximus), Hawaii.

David Fleetham / Flame tip hermit crab (Calcinus minutus), a left-handed hermit crab that is often found in branching hard corals, Yap, Micronesia.

Franco Banfi / Great hermit crab (Dardanus arrosor). Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Hermit crab (Dardanus arrosor), with Shoal of Ornate wrasse (Thalassoma pavo) Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Great hermit crab (Dardanus arrosor). Santa Maria Island, Azores, Portugal, Atlantic Ocean

Alex Mustard / Morgan's reef hermit crab (Paguritta morgani) living in its hole, surrounded by orange sponge the wooden leg of a jetty. Arborek Island, Raja Ampat, West Papua, Indonesia. Dampier Strait, Tropical Wes...

Alex Mustard / Coral hermit crab (Paguritta harmsi) looks out from the reef. Laamu Atoll, Maldives. Indian Ocean

Tui De Roy / Strawberry hermit crab (Coenobita perlatus) on white coral sand beach, Small unhinhabited coral islet in Raa Atoll lagoon, Maldives

Tui De Roy / Strawberry land hermit crab (Coenobita perlatus). On white coral sand beach, Small unhinhabited coral islet in Raa Atoll lagoon, Maldives

Frederique Olivier / Hermit crab (Pagurus) emerging from its shell and cleaning itself before moving away, Uepi Island, Solomon Islands.