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...

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

Pascal Kobeh / Spectacled /spotted box crab (Calappa philargius) on sea floor, Sulu Sea, Philippines.

Georgette Douwma / Box crab (Calappa sp.), Lembeh Strait, North Sulawesi, Indonesia. December.

Franco Banfi / Giant box crab (Calappa calappa) eating a shell, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Giant box crab (Calappa calappa) eating a shell, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Georgette Douwma / Box crab (Calappa sp.). Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Smooth / Red-spotted box crab (Calappa calappa) Sulu Sea, Philippines

Chris Newbert / Box Crab (Calappa sp) female with eggs, Papua New Guinea

Fred Bavendam / Spotted Box Crab (Calappa philargius) male using his claws to grasp a female he will mate with when she is ready, Lembeh Strait, Indonesia

Fred Bavendam / Giant Box Crab (Calappa calappa) female carrying a large clutch of bright orange eggs beneath her abdomen, Lembeh Strait, Indonesia

Sergio Hanquet / Box crab (Callapa granulata), Tenerife, Canary Islands.