David Fleetham / Hawaiian pom-pom / boxer crab (Lybia edmondsoni)with anemones (Triactis sp) that it carries around holding with the claws and using them for defense, waving in front of the possible aggressor. An exam...

Sue Daly / Anemone hermit crab (Pagurus prideaux) getting into a shell, with a Cloak anemone (Adamsia palliata), Sark, British Channel Islands, UK, June.

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

Juergen Freund / Anemone crab {Neopetrolisthes ohshimai} in sea anemone, Indo Pacific

David Hall / Swimmer crab (Lissocarcinus laevis) living commensally with Anemone (Actinodendridae). Pantar, Alor Archipelago, Indonesia.

David Hall / Anemone hermit crab (Dardanus pedunculatus) carrying Anemones (Calliactis polypus) on shell. Mutualism in which anemones are transported to new feeding opportunities whilst providing camouflage and de...

Magnus Lundgren / Wild Wonders of China / Boxer crab (Lybia tessellata) carrying a sea anemone around in each of its claws, Xiaoliuqiu Island, Taiwan

Nick Hawkins / A common spider crab, (Libinia emarginata) camoflages among a group of frilled anemones (Metridium senile) off Bonaventure Island in the Guld of Saint Lawrence, Quebec, Canada. September.

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 / Hermit crab (Dardanus pedunculatus) with Sea anemones (Calliactis polypus) for protection. Tulamben, Bali, Indonesia.

Alex Mustard / Pair of Edible crabs (Cancer pagurus) shelter in the structure of the Wreck of the Rosalie, which is encrusted with Plumose anemones (Metridium senile). Weybourne, north Norfolk, England, United Kingd...

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

David Fleetham / Hawaiian pom-pom / boxer crab (Lybia edmondsoni)with anemones (Triactis sp) that it carries around holding with the claws and using them for defense, waving in front of the possible aggressor. An exam...

David Fleetham / Porcelain crab (Neopetrolisthes maculatus), on anemone. The Island of Yap, Caroline Islands, Micronesia.

Sue Daly / Northern stone crab (Lithodes maja) with an Arctic anemone (Bolocera tuediae) Trondheimsfjord, Norway, July.

Constantinos Petrinos / Anemone hermit crab (Dardanus pedunculatus) on mooring line carrying sea anemones. Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Anemone hermit crab (Dardanus pedunculatus) on mooring line carrying sea anemones. Lembeh Strait, North Sulawesi, Indonesia

Sue Daly / Anemone hermit crab (Pagurus prideaux) attacking another, with Cloak anemones (Adamsia palliata) covering both their shells, Sark, British Channel Islands, UK, October.

Sue Daly / Anemone hermit crab (Pagurus prideaux) sifting gravel on the seabed for food, with a Cloak anemone (Adamsia palliata) covering its shell, Sark, British Channel Islands, UK, October.

Sue Daly / Common hermit crab (Pagurus bernhardus), Sark, British Channel Islands, UK, June.

Sue Daly / Common hermit crab (Pagurus bernhardus) Sark, British Channel Islands, UK, June.

Sue Daly / Common hermit crab (Pagurus bernhardus), Sark, British Channel Islands, UK, June.

Sue Daly / Common hermit crab (Pagurus bernhardus) with a Parasitic anemone (Calliactis parasitica) in its shell, Sark, British Channel Islands, UK, June.

Sue Daly / Sponge spider crab (Inachus) in a Snakelocks anemone (Anemonia viridis), Sark, British Channel Islands, UK, September.

Sue Daly / Sponge spider crab (Inachus) in a Snakelocks anemone (Anemonia viridis), Sark, British Channel Islands, UK, September.

Sue Daly / Sponge spider crab (Inachus) in a Snakelocks anemone (Anemonia viridis), Sark, British Channel Islands, UK, September.

SCOTLAND: The Big Picture / Hermit crab (Pagurus prideauxi) with Cloak anemone (Adamsia palliata) on shell, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

SCOTLAND: The Big Picture / Edible crab (Cancer pagurus) sitting between hydroids (Nemertesia ramosa) and Plumose anemone (Metridium senile) with fish swimming in plankton bloom in background, South Arran Marine Protected Area,...

SCOTLAND: The Big Picture / Fireworks anemone (Pachycerianthus multiplicatus), Loch Duich, Highlands, Scotland, UK, January.

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

Alex Mustard / Harlequin swimming crab (Lissocarcinus laevis) sheltering beneath the tentacles of a tube anemone (Cerianthus sp.). Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Scott Leslie / Arctic Lyre Crab (Hyas coarctatus) among sea anemones and Cunner (Tautogolabrus adspersus) school, Bonne Bay, Newfoundland, Canada

Juergen Freund / Hermit crab (Dardanus pedunculatus) with anemones, at Kimbe Bay, West New Britain, Papua New Guinea.

Sue Daly / Anemone Hermit Crab (Pagurus prideaux) with Cloak Anemone (Adamsia palliata) and Parasitic Anemone (Calliactis parasitica) Bouley Bay, Jersey, British Channel Islands.

Sue Daly / Anemone Hermit Crab (Pagurus prideaux) with Cloak Anemone (Adamsia palliata) Bouley Bay, Jersey, British Channel Islands.

Alex Mustard / Hermit crab (Dardanus calidus) with hermit crab anemone's (Calliactis parasitica) attached to its shell. This anemone lives exclusively on the shells of hermit crabs. Tavolara Marine Protected Area, O...

Franco Banfi / Spider crab (Maja squinado) and Yellow cluster anemone (Parazoanthus axinellae) Stupiste Out dive site, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Orang-utan crab (Achaeus japonicus) on anemones, Waigeo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Franco Banfi / Spotted porcelain crab (Neopetrolisthes oshimai) on sea anemone, at Din ding warna banjak dive site, Kervo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific 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 / Hermit crab with anemone. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

Solvin Zankl / Hermit crab (Dardanus arrosor) and Parasitic anemone (Calliactis parasitica) San Pietro Island, Sardinia, Italy, Mediterranean, July

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

Juergen Freund / Porcelain anemone crab (Neopetrolisthes maculatus) among tentacles of anemone, Indo-pacific.

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 / Porcelain anemone crab (Neopetrolisthes maculosus / maculatus). Lembeh Strait, North Sulawesi, Indonesia.

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

Tim Laman / Anemone / Porcelain crab (Neopetrolisthes maculatus) in its host anemone. Malapascua Island. Visayan Sea, Philippines

Hiroya Minakuchi / Spotted Anemone Crab (Neopetrolisthes maculatus) and Anemonefish (Amphiprion sp) in sea anemone host tentacles, Celebes Sea

Chris Newbert / Sea Anemone Crab (Lissocarcinus laevis) at base of anemone, Indonesia

Chris Newbert / Porcelain Crab (Porcellanella sp) camouflaged on Sea Pen (Virgularia sp), Indonesia

Chris Newbert / Sea Anemone Crab (Lissocarcinus laevis), Indonesia

Chris Newbert / Hermit Crab (Dardanus sp) with anemone covered shell, Papua New Guinea

Chris Newbert / Porcelain Crab (Porcellanidae) on Sea Pen (Scytalium sarsii), Papua New Guinea

Juergen Freund / Anemone crab {Neopetrolisthes ohshimai} in sea anemone, Indo Pacific

Alan James / Spiny spider crab {Maja squinado} with Pulmose anemone, UK

Nature Production / Anemone Hermit Crab {Dardanus pedunculatus} camouflaged with sea anemones {Actiniae} on its shell, Izu, Shizuoka, Japan

Juergen Freund / Anemone crab (Neopetrolisthes ohshimai) in sea anemone, Indo-Pacific

Chris Newbert / Spotted Anemone Crab (Neopetrolisthes maculatus) on Anemone mantle (Stichodactyla sp) feeding on plankton with feather net arms, 70 feet deep, Solomon Islands

Chris Newbert / Harlequin Crab (Lissocarcinus orbicularis) on Tube Anemone, the crab lives protected on the tube of the anemone as its stinging tentacles wave in front of it, 40 feet deep, Papua New Guinea

Chris Newbert / Arrow Crab (Stenorhynchus seticornis) in Anemone (Heteractis sp) 60 feet deep, Caribbean

Doug Perrine / Porcelain crab {Neopetrolisthes maculatus} on Sea anemone {Cryptodendrum adhaesivum} Surin Is, Thailand

Fred Bavendam / Anemone Hermit Crab (Dardanus pedunculatus) carrying Sea Anemones on its shell for protection from predators, Bali, Indonesia

Chris Newbert / Spotted Anemone Crab (Neopetrolisthes maculatus) female on her Anemone home (Stichodactyla mertensii) feeding on plankton with her feather net arms, with eggs held in brood pouch formed by tail, 50 fe...

Chris Newbert / Spotted Anemone Crab (Neopetrolisthes maculatus) female on her Anemone home (Stichodactyla mertensii) feeding on plankton with her feather net arms, with eggs held in brood pouch formed by tail, 50 fe...

Chris Newbert / Spotted Anemone Crab (Neopetrolisthes maculatus) female on her Anemone home (Stichodactyla mertensii) feeding on plankton with her feather net arms, with eggs held in brood pouch formed by tail, 50 fe...

Hiroya Minakuchi / Spotted Anemone Crab (Neopetrolisthes maculatus) living in Sea Anemone tentacles, Sulu Sea, Borneo, Malaysia

Norbert Wu / Spotted Anemone Crab (Neopetrolisthes maculatus) pair throwing out fine nets to trap plankton, Seychelles

Chris Newbert / Spotted Anemone Crab (Neopetrolisthes maculatus) on Sea Anemone, Ponape, Micronesia

Birgitte Wilms / Spotted Anemone Crab (Neopetrolisthes maculatus) female on Anemone (Stichodactyla mertensii) home with eggs held in brood pouch formed by tail, feeding on plankton with her feather net arms, Solomon I...

Fred Bavendam / Anemone Hermit Crab (Dardanus pedunculatus) carries Sea Anemones on its shell for protection from predators, Bali, Indonesia

Fred Bavendam / Anemone Hermit Crab (Dardanus pedunculatus) with Sea Anemones on its shell, Manado, North Sulawesi, Indonesia

GEORGETTE DOUWMA / Porcelain crab {Neopetrolisthes maculatus} on sea anemone. Milne Bay, Papua New Guinea

Gary Bell/ Oceanwide / Anemone Hermit Crab (Dardanus pedunculatus) covered with sea anemones used for camouflage, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Boxing Crab (Lybia tessellata) holding sea anemones used for defense, Anilao, Philippines

Gary Bell/ Oceanwide / Boxing Crab (Lybia tessellata) holding sea anemone for defense, Bali, Indonesia

Gary Bell/ Oceanwide / Boxing Crab (Lybia tessellata) female with eggs holding sea anemone for defense, Bali, Indonesia

David Fleetham / Porcelain crab (Neopetrolisthes maculatus) on a bed of pale green anemone, Mabul Island, Malaysia.

Pete Oxford / Pale Anemone Hermit Crab (Dardanus deformis), Banda Sea, Indonesia

Scott Leslie / Arctic Lyre Crab (Hyas coarctatus) among sea anemones, Bonne Bay, Newfoundland, Canada

Roberto Rinaldi / Porcelain anemone crab (Neopetrolisthes maculatus) in anemone, Kudat, Sabah, Borneo, Malaysia. Not a true crab but a squatlobster.

Nature Production / Anemone Hermit Crab {Dardanus pedunculatus} with Sea Anemones {Calliactis polypus} attached, Izu Osezaki, Shizuoka, Japan

Juergen Freund / Anemone crab in sea anemone {Neopetrolisthes ohshimai} Philippines

Juergen Freund / Anemone hermit crab (Dardanus pedunculatus) with Sea anemones on shell. Indo-pacific

Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) and a Spotted porcelain crab (Neopetrolisthes maculatus) living together in an anemone. Bitung, North Sulawesi, Indonesia, Lembeh Strait, Molucca Sea.

Alex Mustard / Sharpnose crab (Scyra acutifrons) feeding on passing particles, whilst hiding in a gap between a White short plumose anemone (Metridium senile) and a Yellow encrusting sponge (Myxilla lacunosa), Brown...

Shane Gross / Graceful kelp crab (Pugettia gracilis) holding on to Giant plumose anemone (Metridium farcimen), Prince William Sound, Alaska, USA, Pacific Ocean.

David Fleetham / An endemic Hawaiian pom-pom crab / Boxer crab (Lybia edmondsoni) carrying a juvenile Anemone (Triactis producta) in its claws as a defense mechanism. A mutualistic symbiosis, with the anemone being tr...

David Hall / Yellowline arrow crab (Stenorhynchus seticornis) living in association with Giant Caribbean sea anemone (Condylactis gigantea), Dominica, Caribbean.

Georgette Douwma / RF - Jeweled anemone hermit crab (Dardanus gemmatus) on black background, Malapascua Island, Philippines. (This image may be licensed either as rights managed or royalty free.)

Henley Spiers / Velvet swimming crab (Necora puber) using a Snakelocks anemone (Anemonia viridis) for protection, Torbay, Devon, England, UK. July.

Lewis Jefferies / Hermit crab (Pagurus prideaux) with symbiotic Cloak anemone (Adamsia Pallaita) feeding amongst Common eelgrass (Zostera marina) meadow, Helford River Estuary, Cornwall, UK, May.

Alex Mustard / Leach's spider crab (Inachus phalangium) sheltering beneath the stinging tentacles of Snakelocks anemone (Anemonia viridis). Swanage, Dorset, UK, English Channel.