Bernard Castelein / Marsh Crab (Neosarmatium meinerti) Zanzibar, Tanzania

Doug Wechsler / Marsh fiddler crabs on saltmarsh mudflat {Uca pugnax} New Jersey, USA Delaware Bay

Piotr Naskrecki / Squareback Marsh Crab (Armases cinereum) female, in the family of marine Rock Crabs (Sesarmidae), Costa Rica

Piotr Naskrecki / Atlantic Marsh Fiddler (Uca pugnax) males have one larger front claw which they use to attract females, Dominican Republic

Kim Taylor / Crab spider {Misumena sp.} with Honeybee prey on Marsh marigold, UK.

Tui De Roy / Crab-eating Fox (Cerdocyon thous) emerging from scrub to forage in marshy savannah, Caiman Ecological Refuge, Pantanal, Brazil

Piotr Naskrecki / Atlantic Marsh Fiddler (Uca pugnax) males have one larger front claw and which they use to attract females, Dominican Republic