Linda Pitkin / 2020VISION / Spiny spider crab (Maja brachydactyla / squinado) pair on rock covered with red algae, Lundy Island Marine Conservation Zone, Devon, England, UK, May.

Christophe Courteau / Velvet swimming crab portrait {Liocarcinus / Necora puber} Brittany France

Christophe Courteau / Edible crab in tide pool split level {Cancer pagurus} Brittany France

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) emerging from sea onto beach, with Sally lightfoot crabs (Grasopus graspus) and Galapagos Fur Seal in background. Galapagos Islands, Ecuador, June.

Alex Mustard / 2020VISION / Common hermit crab (Pagurus bernhardus), Loch Leven, Ballachulish, Scotland, UK, April

Alex Mustard / 2020VISION / Great spider crab (Hyas araneus) on Deadman's fingers (Alcyonium digitatum) coral, feeding in a current, Loch Carron, Ross and Cromarty, Scotland, UK, April

Alex Hyde / Shore Crab (Carcinus maenas) against white background. From the Isle of Skye, Inner Hebrides, Scotland, UK.

Alex Hyde / Various rockpool animals and seaweeds, photographed on a white background. Isle of Skye, Inner Hebrides, Scotland, UK, March. Digital composite.

Nick Upton / Common Shore crab (Carcinus maenas) on clump of Toothed wrack (Fucus serratus) exposed on shore at low tide, St. Bees, Cumbria, UK, July.

Toby Roxburgh / 2020VISION / Fishermen aboard a small fishing boat packing a container full of Spiny spider crabs (Maja Squinado), caught using tangle nets, Cornwall, England, UK, June 2011

Linda Pitkin / 2020VISION / Edible crab (Cancer pagurus), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, August 2011. Did you know? A large female Edible crab can carry up to 20 million eggs...

Linda Pitkin / 2020VISION / Velvet Swimming Crab (Necora puber / Liocarcinus puber), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, October, 2011

MYN / Jerry Monkman / Acadian hermit crab (Pagurus acadianus) emerging from shell, Rye, New Hampshire, USA, January. meetyourneighbours.net project

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

Ole Jorgen Liodden / Galapagos Ghost Crab (Ocypode gaudichaudii) fighting on the beach. Galapagos

Alex Mustard / 2020VISION / Aggregation of Spider crabs (Maja squinado) in shallow water off Burton Bradstock, Dorset, UK, August. 2020VISION Book Plate.

Alex Mustard / 2020VISION / Hermit crab (Pagurus bernhardus) moving forward, Loch Long, Argyll and Bute, Scotland, UK, April. Did you know? Despite their name, hermit crabs can be quite sociable creatures.

Alex Mustard / 2020VISION / Long legged spider crab (Macropodia rostrata) on Dead man's fingers (Alcyonium digitatum). Loch Carron, Ross and Cromarty, Scotland, UK, April

Alex Mustard / 2020VISION / Leach's spider crab (Inachus phalangium) sheltering from the current beneath tentacles of Snakelocks anemone (Anemonia viridis) Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Masked crab (Corystes cassivelaunus) on sandy seabed, Studland Bay, Dorset, UK, May

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

Steve Nicholls / Horseshoe crabs (Limulus polyphemus) spawning at low tide, Slaughter Beach, Delaware, USA, May

Juergen Freund / Tiny reef crab on soft coral, West New Britain, Papua New Guinea.

Juergen Freund / Zebra / Adam's urchin crab with eggs (Zebrida adamsii) on Fire sea urchin (Mespilia globulus), Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Horsehoe crab (Tachypleus gigas) swimming on its back with gills creating the propulsion, Palawan, Philippines. Did you know? Horseshoe crabs are more closely related to spiders than crabs.

Juergen Freund / Horsehoe crab (Tachypleus gigas) underside, Palawan, Philippines

Juergen Freund / Boxer / Pom pom crab (Lybia tesselata) on coral, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Carrier / Sea urchin crab (Dorippe frascone) carrying a fire urchin as a deterrent to predators. Lembeh Strait, North Sulawesi, Indonesia

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

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective showing crab beneath and fluvial habitat. Foreste Casentinesi National Park, Italy, July.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) brandishing claws in defensive posture. Foreste Casentinesi National Park, Italy, July.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective showing crab beneath and fluvial habitat. Foreste Casentinesi National Park, Italy, July.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective of underwater and habitat. Foreste Casentinesi National Park, Italy, July.

Solvin Zankl / After an incubation period of 45 to 55 days and several days long ascent through the sand the hatchling Olive ridley turtles (Lepidochelys olivacea) emerge all together. Ostional Beach, Costa Rica, No...

Graham Eaton / Spiny Spider Crab (Maja squinado) with claws raised in an aggressive posture, in a fast tide, Abersoch, Wales, UK, May.

Graham Eaton / Velvet swimming crab (Necora puber) pair mating, Trefor, Wales, UK, July.

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.

Toby Roxburgh / Cooked edible crab (Cancer pagurus) being lifted from a pot of boiling water, England, UK, 2009.

Jeff Rotman / Japanese Giant Spider Crab (Macrocheira kaempferi) World's Largest Crustacean in Tokyo Aquarium, Japan.

Wild Wonders of Europe / Lundgren / Edible crab (Cancer pagurus) portrait, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Hermit crab (Pagurus pubescens) on Kelp, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Zankl / Ghost / Sand crab (Ocypode cursor) on beach, Dalyan Delta, Turkey, August 2009

Wild Wonders of Europe / Zankl / Spiny spider crab (Maja squinado) on seaweed, Malta, Mediteranean, May 2009

Wild Wonders of Europe / Zankl / Spiny spider crab (Maja squinado) Malta, Mediteranean, May 2009

Wild Wonders of Europe / Quinta / Crab (Eriphia verrucosa) in shallow water, Alentejo, Natural Park of South West Alentejano and Costa Vicentina, Portugal, June 2009

Wild Wonders of Europe / Quinta / Crab (Eriphia verrucosa) on rock, Alentejo, Natural Park of South West Alentejano and Costa Vicentina, Portugal, June 2009

Wild Wonders of Europe / Lundgren / Northern stone crab (Lithodes maja) pair, Trondheimsfjorden, Norway, February 2009

Wild Wonders of Europe / Lundgren / Pair of Common hermit crabs (Pagurus bernhardus) male carrying female until she leaves her shell and they can mate, Trondheimsfjorden, Norway, February 2009

Wild Wonders of Europe / Lundgren / Great spider crab (Hyas araneus) decorated with hydroids, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Long-legged spider crab (Macropodia rostrata) on a new kelp leaf, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Close-up of Common shore crab (Carcinus maenas) Lofoten, Norway, November 2008

Wild Wonders of Europe / Lundgren / Edible crab (Cancer pagurus) close-up of face, Saltstraumen, Bod, Norway, October 2008 Wild Wonders kids book.

Juan Carlos Munoz / Crab walking over beach leaving tracks in the wet sand, Floreana Island, Galapagos, January

Kim Taylor / Land hermit crab (Coenobita species) captive, Southern Madagascar

Juergen Freund / Soft coral crab / Dendronephthya crab (Hoplophrys oatesii) camouflaged on the tip of a soft coral. Indo-pacific

Georgette Douwma / Arrowhead crab (Huenia heraldica) on soft coral. Rinca, Indonesia

Solvin Zankl / Anomuran larva of a Hermit crab, Atlantic ocean

Solvin Zankl / Deepsea planktonic megalopa stage of crab development, Atlantic ocean.

Fabio Liverani / Freshwater crab {Potamon fluviatile} in Resina river, Umbria, Italy

Fabio Liverani / Split level image of Freshwater crab {Potamon fluviatile} in Resina river, Umbria, Italy

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

Georgette Douwma / Edible crab (Cancer pagurus) in kelp, St. Abbs, North Sea, Atlantic Ocean.

Juergen Freund / Arrow crab on sponge (Stenorhynchus seticornis) Caribbean

Juergen Freund / Thousands of Christmas Island Red crabs on rocky shore (Gecarcoidea natalis)

Juergen Freund / Christmas Island red crab (Gecarcoidea natalis) wearing Father Christmas hat, Christmas Island, Indian Ocean

Doug Perrine / Coconut / Robber crab climbing palm tree {Birgus latro} Palau, Micronesia

David Shale / (Neolithodes sp) a benthic, deep sea crab., deep sea Atlantic ocean

John Cancalosi / Dungeness crab caught in net {Cancer magister} Alaska, USA

Jean E. Roche / Land crab burrowing in sand on beach {Ocypode quadrata} Guadeloupe 2000.

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

Juergen Freund / Christmas Island red crabs (Gecarcidea natalis)Indian Ocean

Juergen Freund / Decorator spider crab {Camposcia refusa}. Indo-Pacific

Constantinos Petrinos / Decorator crab {Miccipa philyra}. Sulawesi, Indonesia.

Juergen Freund / Arrow crab on brain coral {Stenorhynchus seticornis} Caribbean Sea, Cuba

Pete Oxford / Fiddler crab {Uca genus} Coroni Swamp, Guyana, Caribbean. Note large claw

Juergen Freund / Christmas Island red crabs mating {Gecarcoidea natalis} Indian Ocean, Australia

Warwick Sloss / Mudcrab {Scylla serrata} amongst mangroves at low tide, Darwin, NT, Australia

Warwick Sloss / Mudcrab {Scylla serrata} amongst mangroves at low tide, Darwin, NT, Australia

Mike Potts / Male fiddler crab {Uca sp}. Queensland, Australia.

Pete Oxford / Coconut crab (Bigrus latro) on tree trunk, Aldabra, Seychelles.

Michio Hoshino / Marine Iguana (Amblyrhynchus cristatus) group with Sally Lightfoot Crabs (Grapsus grapsus), Galapagos Islands, Ecuador

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) using its suction discs to hold two crabs it has caught, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) scurrying across the ocean floor as it forages for crabs, Quadra Island, British Columbia, Canada

Hugh Pearson / Golden ghost crab {Ocypode convexa} 80 Mile Beach, Western Australia

Constantinos Petrinos / Porcelain crab amongst anemone tentacles, Solomon Islands, Pacific

Pete Oxford / Coconut (Robber) crab climbing coconut tree, Aldabra Seychelles

Pete Oxford / Sally lightfoot crab {Grapsus grapsus} San Cristobal Is, Galapagos Islands, Ecuador Book page 100

Phil Chapman / Ghost crab on beach at night (Ocypode sp) Madagascar

Juergen Freund / Masses of Christmas Island Red Crabs spawning on the beach.

Juergen Freund / Coconut Crab on beach, Christmas Island, Indian Ocean.

Georgette Douwma / Fiddler crab {Uca sp} male at burrow entrance. Bunaken, Sulawesi, Indonesia - note large claw

Jeff Rotman / Spider crab {Schizophrys sp} on soft coral {Dendronepthya sp} Bismarck sea, Papua New Guinea

Gavin Hellier / Fishermans Wharf sign at San Francisco, California, USA 2011

Sue Daly / Anemone Hermit Crab (Pagurus prideauxi). Maseline harbour, Sark, British Channel Islands, October.

Sue Daly / Anemone Hermit Crab (Pagurus prideauxi). Maseline harbour, Sark, British Channel Islands, October.

Sue Daly / Anemone Hermit Crab (Pagurus prideaux) courtship behaviour. Maseline Harbour, Sark, British Channel Islands, September.