John Shaw / Sally lightfoot crabs (Grapsus grapsus) on the beach at Puerto Egas, Santiago Island, Galapagos, May.
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Andy Rouse / Sally lightfoot crab, (Grapsus grapsus), feeding on marine iguana parasites and dead skin, Galapagos
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Nick Hawkins / European green crab (Carcinus maenas), an invasive species in North America, Kejimkujik Seaside National Park, Nova Scotia, Canada. July.
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Alex Mustard / Portrait of Sally lightfoot crab (Grapsus grapsus) on a beach. San Cristobal Island, Galapagos Islands, Ecuador. Tropical East Pacific Ocean.
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Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey
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Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey
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Tui De Roy / Dead Sally-lightfoot crab (Grapsus grapsus) washed up in surf, Puerto Egas, James Bay, Santiago Island, Galapagos, Ecuador, May.
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Alex Hyde / Shore Crab (Carcinus maenas) against white background. From the Isle of Skye, Inner Hebrides, Scotland, UK.
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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.
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Ole Jorgen Liodden / Galapagos Ghost Crab (Ocypode gaudichaudii) fighting on the beach. Galapagos
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Wild Wonders of Europe / Lundgren / Close-up of Common shore crab (Carcinus maenas) Lofoten, Norway, November 2008
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Juergen Freund / Thousands of Christmas Island Red crabs on rocky shore (Gecarcoidea natalis)
