Fred Bavendam / Sponge Crab (Austrodromidia octodentata) wearing a hat of yellow sponge for camouflage, Edithburgh, South Australia, Australia

Fred Bavendam / Sponge Crab (Austrodromidia octodentata) wearing a Hat of Leach's Compound Ascidian (Botrylloides leachi) instead of a Sponge, South Australia

Alex Mustard / Sleepy sponge crab (Dromia dormia) climbing over a rock, carrying its sea squirt (Didemnum molle) disguise, with brittlestar. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island P...

Alex Mustard / Sponge crab (Dromia dromia) carrying a purple sponge on its back, has climbed on a pinky-orange sponge to feed at night. Baa Atoll, Maldives.

Fred Bavendam / Sponge Crab (Austrodromidia octodentata) with clear plastic over its shell instead of a sponge, Edithburgh, Australia

Fred Bavendam / Sponge Crab (Austrodromidia octodentata) wearing a hat of blue sponge for camouflage, Edithburgh, South Australia

Doug Perrine / Sponge crab {Dromia sp} covers itself with sponges for camouflage, Dominica, Caribbean

Sue Daly / Sponge crab {Dromia personata} off Jersey, Channel Is, UK

Constantinos Petrinos / Sponge crab {Cryptodromia genus} Sulawesi Indonesia. Indo Pacific

Juergen Freund / Sponge crab with camouflaging sponge attached to shell, Phillippines

Gary Bell/ Oceanwide / Sponge Crab (Cryptodromia octodetata) with sponge used for camouflage, Edithburgh, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Sponge Crab (Dromidiopsis sp) with sponge used for protection, Anilao, Philippines