Constantinos Petrinos / Red hermit crab {Dardanus megistos} Sulawesi, 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 / Red hermit crab (Dardanus megistos) Xiaoliuqiu Island, Taiwan

Magnus Lundgren / Wild Wonders of China / Anemone hermit crab (Dardanus pedunculatus) Xiaoliuqiu Island, Taiwan

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.

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

David Fleetham / Eye stalks and antennae of a hermit crab (Dardanus lagopodes) off the island of Yap, Micronesia.

David Fleetham / Hermit crab (Dardanus lagopodes) in a white shell on the seafloor. Yap, Micronesia.

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

Constantinos Petrinos / Spotted hermit crab (Dardanus megistos) running at night and stirring up sand. 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.

Georgette Douwma / Jeweled anemone hermit crab (Dardanus gemmatus). Lembeh Strait, North Sulawesi, Indonesia.

Tony Wu / Anemone hermit crab (Dardanus pedunculatus) capturing and eating a mollusc, Lembeh Strait, North Sulawesi, Indonesia.

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

Georgette Douwma / Hermit crab (Dardanus pedunculatus) Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / White-spotted hermit crab (Dardanus megistos) Mabul, Malaysia.

Georgette Douwma / White spotted hermit crab (Dardanus megistos) Lembeh Strait, Sulawesi, Indonesia.

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

Pascal Kobeh / White spot hermit crab (Dardanus megistos) at night, Maldives. Indian Ocean.

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...

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

D. Parer & E. Parer-Cook / Hermit Crab (Dardanus lagopodes), Indonesia

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.

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

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 / 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

Bernard Castelein / African swallowtail butterfly (Papilio dardanus) at rest on leaves, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Red Hermit Crab (Dardanus megistos) with shell, in shallow water, Kizimkazi, Zanzibar, Tanzania

Sue Daly / Red hermit crab (Dardanus megistos) Lembeh Straits, Sulawesi, Indonesia

Sue Daly / Hermit crab (Dardanus sp) Lembeh Straits, Sulawesi, Indonesia

GEORGETTE DOUWMA / Blue-knee hermit crab (Dardanus guttatus) Misool, Raja Ampat, West Papua, Indonesia.

Luis Quinta / Hermit crab {Dardanus calidus} inside Cowrie shell, Azores

GEORGETTE DOUWMA / Anemone hermit crab (Dardanus pedunculatus) with shell covered in debris, Komodo, Indonesia

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

Doug Perrine / Hermit crab {Dardanus venosus} with symbiotic anemones {Calliactis sp} growing on its shell, providing camouflage and protection, Dominica, Caribbean

Albert Lleal / Hermit Crab (Dardanus arrosor) using a Sponge (Suberites domuncula) as its home, Mediterranean Sea, Spain

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

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

Chris Newbert / Hermit Crab (Dardanus sp) riding on large Hermit Crab (Dardanus sp) which is grabbing a Cone Shell, 60 feet deep, Papua New Guinea

Piotr Naskrecki / Land Snail (Caracolus sp) shell carried by Whitespotted Hermit (Dardanus megistos), Caribbean

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Doug Perrine / Red hermit crab {Dardanus megistos} Ko Bon, Thailand

GEORGETTE DOUWMA / Red hermit crab (Dardanus megistos) using a Grey bonnet / helmet shell (Phalium glaucum) as a home. Lembeh Strait, North Sulawesi, Indonesia

GEORGETTE DOUWMA / Red hermit crab (Dardanus megistos) using a Grey bonnet / helmet shell (Phalium glaucum) as a home. Lembeh Strait, North Sulawesi, Indonesia

Jose B. Ruiz / Hermit Crab {Dardanus calidus} Mediterranean, near Atlanticm, off Spain

Jose B. Ruiz / Hermit crab {Dardanus calidus} underwater. Spain.

Brent Hedges / Red hermit crab {Dardanus megistos} close-up, Solomon Islands, South Pacific

Chris Newbert / Hermit Crab (Dardanus sp) crawling on a Nudibranch (Jorunna funebris), Papua New Guinea

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

Chris Newbert / Hermit Crab (Dardanus lagopodes) inside the foot of a Feather Star (Oxycomanthus bennetti) 60 feet deep, Solomon Islands

Norbert Wu / Stareye Hermit (Dardanus venosus) eyes on stalks, hair on arms used for sensing food in sand, Caribbean

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

Fred Bavendam / Whitespotted Hermit (Dardanus megistos) living in a shell, Manado, North Sulawesi, Indonesia

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

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

Jeff Rotman / Green eyed hermit crab {Dardanus tinctor} Red Sea

Constantinos Petrinos / Red hermit crab, Sulawesi, Indonesia.

Juergen Freund / Anemone hermit crab (Dardanus pedunculatus) and anemone. Indo-Pacific Ocean

Juergen Freund / Anemone hermit crab with anemone attached, Indo-Pacific Ocean.

Gary Bell/ Oceanwide / Hermit Crab (Dardanus lagopodes) female carrying eggs, Great Barrier Reef, Australia

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

Gary Bell/ Oceanwide / Hermit Crab (Dardanus lagopodes), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Hermit Crab (Dardanus lagopodes), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Hermit Crab (Dardanus guttatus), Bali, Indonesia

Gary Bell/ Oceanwide / Hermit Crab (Dardanus lagopodes), Great Barrier Reef, Australia

David Fleetham / Close-up of eye stalks and antennae of hermit crab (Dardanus lagopodes), Malaysia.

David Fleetham / Hermit crab (Dardanus sp.), less than an inch across, Rarotonga, Cook Islands.

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

Angelo Giampiccolo / Hermit crab (Dardanus sp.) off Costa Viola, Calabria, Italy.

Jane Burton / Hermit crab (Dardanus megistos) portrait, captive

Jane Burton / Hermit crab (Dardanus megistos) feeding on fish head, captive

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

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Piotr Naskrecki / Hermit Crab (Dardanus sp) emerging from its shell, Hispaniola

Constantinos Petrinos / Anemone Hermit crab {Dardanus pedunculatus} carrying anemone, Sulawesi

Juergen Freund / Anemone hermit crab with anemones on shell {Dardanus pedunculatus} Indo-pacific

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

David Fleetham / Left handed hermit crab (Dardanus gemmatus) resting on seabed with two Hermit crab anemone's (Calliactis polypus) on shell, Hawaii, Pacific Ocean.

David Fleetham / White-spotted hermit crab (Dardanus megistos) portrait, Philippines, Pacific Ocean.

Joel Sartore / Photo Ark / White-spotted hermit crab (Dardanus megistos) emerging from its shell before walking out of frame, Riverbanks Zoo. Captive.

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.)

Tony Wu / Mauve-eyed hermit crab (Dardanus crassimanus) feeding on a Red cornetfish (Fistularia petimba), Kyushu, Japan, Pacific Ocean.