Chris Newbert / Decorator Crab, holding a broken piece of Sea Fan as camouflage, night, Red Sea

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

Birgitte Wilms / Hairy Sponge Crab (Dromidia antillensis) 60 feet deep, Indonesia

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

Chris Newbert / Spider Crab (Cyclocoeloma tuberculata) camouflaged, 60 feet deep, Papua New Guinea

Chris Newbert / Spider Crab (Majidae) covered in Sponges, on Halimeda Algae (Halimeda macroloba) 60 feet deep, Papua New Guinea

Chris Newbert / Hairy Sponge Crab (Dromidia antillensis) 40 feet deep, Papua New Guinea

Chris Newbert / Hairy Sponge Crab (Dromidia antillensis) holding a broken piece of Sea Fan as camouflage, night, Red Sea