Nick Upton / Juvenile Goldenrod spider (Misumena vatia) camouflaged on a Common hogweed (Heracleum sphondylium) flowerhead, reacting to and catching a fly (Muscidae), Wiltshire, England, UK, June.

Pascal Kobeh / Aggregation of thousands of Spider crabs (Leptomithrax gaimardii) for moulting, South Australia Basin, Australia. Pacific Ocean.

Pascal Kobeh / Aggregation of thousands of Spider crabs (Leptomithrax gaimardii) for moulting, South Australia Basin, Australia. Pacific Ocean.

Alex Mustard / Box crab (Calappa sp.) female emerging from the sand and shakes her body to release her tiny young. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific...

Alex Mustard / West Indian spider crab (Mithrax spinosissimus) shelter in a giant barrel sponge (Xestospongia muta) on a coral reef. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

David Hall / Decorator crab (Majidae) covered with hydroid polyps, providing camouflage and defensive sting. On Soft coral (Alcyonacea). Pantar, Alor Archipelago, Indonesia; November, 2006

Magnus Lundgren / Wild Wonders of China / Spider crab (Majidae sp) Xiaoliuqiu Island, Taiwan

Pascal Kobeh / Lesser / Little spider crab (Maja crispata), Canary Islands

Pascal Kobeh / Spiny spider crab (Maja brachydactyla), Sulu sea, Philippines

Pascal Kobeh / The sloughed shell of a Shame crab (Cryptosoma cristatum, fam. Calappidae) on the sandy bottom, Canary Islands

Heather Angel / White flower crab spider (Misumena vatia) camouflaged against Golden Mexican orange blossom (Choysia ternata 'Sundance') flower. Spider is an ambush predator killing visiting pollinators such...

Shane Gross / Channel clinging crab (Mithrax spinosissimus) in a pond on Eleuthera Island, Bahamas.