John Shaw / Sally lightfoot crabs (Grapsus grapsus) on the beach at Puerto Egas, Santiago Island, Galapagos, May.

Alex Mustard / Sharpnose crab (Scyra acutifrons) sheltering in soft coral, while covered with tunicates. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada.

Chris Newbert / Xeno Crab (Xenocarcinus tuberculatus) on Wire Coral (Cirrhipathes sp) 70 feet deep, Papua New Guinea

Norbert Wu / Cryptic Teardrop Crab (Pelia mutica) on Sea Fan, covered with Sponges for camouflage, Roatan Island, Honduras

Fred Bavendam / Crab (Xenocarcinus sp) living on a Gorgonian Sea Fan, Milne Bay, Papua New Guinea

Alex Mustard / Sharpnose crab (Scyra acutifrons) male, crawling along the stipe of a Palm kelp (Eisenia arborea), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Alex Mustard / Sharpnose crab (Scyra acutifrons) hiding in a Purple sponge, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

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...