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

Alex Mustard / Soft coral crab (Hoplophrys oatesil) climbing out onto a branch of yellow and red soft coral (Dendronephthya sp.) at night. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West P...

Tony Wu / Arrowhead crab (Huenia heraldica) carrying around a hydroid for disguise, Kashiwajima, Japan.

Constantinos Petrinos / Soft coral crab (Hoplophrys oatesii) camouflaged on Red Soft Coral (Dendronephthya sp.) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Soft coral crab (Hoplophrys oatesii) camouflaged on Red Soft Coral (Dendronephthya sp.) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Soft coral crab (Hoplophrys oatesii) camouflaged on Red Soft Coral (Dendronephthya sp.) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Soft coral crab (Hoplophrys oatesii) camouflaged on Red Soft Coral (Dendronephthya sp.) Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Xeno crab (Xenocarcinus tuberculatus) climbs up a whip coral. Sangeang Island, Sumbawa, Indonesia. Flores Sea.

Claudio Contreras / Cryptic teardrop crab (Pelia mutica) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Constantinos Petrinos / Soft coral crab (Hoplophrys oatesii) camouflaged on Red Soft Coral (Dendronephthya sp.) Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Longhorn decorator crab (Chorilia longipes), Alaska, USA, Gulf of Alaska. Pacific ocean.

Alex Mustard / Candy crab (Hoplophrys oatesii) on Dendronephthya soft coral bush. Tulamben Bay, Bali, Indonesia. Java Sea.