Juergen Freund / Arrow crab on sponge (Stenorhynchus seticornis) Caribbean

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

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a rockpool low on th shore alongside a group of Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a low shore rockpool alongside other sponges and some Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Sue Daly / Sponge crab (Inachus sp) hiding in anemone, Channel Islands, UK June

Graham Eaton / Yellowline Arrow Crab (Stenorhynchus seticomis) in an Azure Vase Sponge (Callyspongia plicifera). St Lucia, West Indies, July.

Juergen Freund / Sponge decorator crab (Hyastenus elatus) almost invisible under the sponges attached to its shell. Lembeh Strait, North Sulawesi, Indonesia.

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

Albert Lleal / Hermit Crab (Dardanus arrosor) using a Sponge (Suberites domuncula) as its home, Mediterranean Sea, Spain

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

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

Chris Newbert / Left-handed Hermit Crab (Paguristes sp) peering out from a vacated Serpulid Worm hole in the reef surrounded by a Red Encrusting Sponge, Solomon Islands

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

Norbert Wu / Spider Crab (Schizophrys dama) covers itself with sponges and hydroids to camouflage itself, Borneo

Fred Bavendam / Fringed Sponge Crab (Dromidiopsis globosa) wearing a hat of a large Solitary Ascidian, Edithburgh, South Australia

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

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) on tube sponge at night, Belize Cayes, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) in tube sponge at night, Belize Cayes, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) on a tube sponge at night, Belize Cayes, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus setircornis) on tube sponge, at night in the Belize Cayos, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) in a tube sponge at night, Belize Cayes, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) inside tube sponge at night, Belize Cayes, Caribbean.

Carine Schrurs / Sponge crab {Lauridromia dehaani} carries cocount shell Anilao Batangas Philippines

Juergen Freund / Sponge {Axinellida} Decorator crab. Indo-pacific