Juergen Freund / Land Hermit crab using a plastic bottle cap as its home. Kavieng, Papua New Guinea, June 2010

Juergen Freund / Hermit crab with shell covered in soft coral (Heteroxenia fuscescens) Lembeh Strait, North Sulawesi, Indonesia

Wild Wonders of Europe / Lundgren / Hermit crab (Pagurus pubescens) on Kelp, Saltstraumen, Bod, Norway, October 2008

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) colony in Hump Coral (Porites sp), Solomon Islands

Chris Newbert / Hermit Crab (Paguritta gracilipes) in Hump Coral (Porites sp) 30 feet deep, Solomon Islands

Alex Mustard / Portrait of Morgan's coral hermit crab (Paguritta morgani) looking out of its burrow in a hard coral colony. These hermit crabs are sedentary, remaining in their burrows, rather than carrying arou...

David Hall / Anemone hermit crab (Dardanus pedunculatus) carrying Anemones (Calliactis polypus) on shell. Mutualism in which anemones are transported to new feeding opportunities whilst providing camouflage and de...

Magnus Lundgren / Wild Wonders of China / Red hermit crab (Dardanus megistos) Xiaoliuqiu Island, Taiwan

Magnus Lundgren / Wild Wonders of China / Anemone hermit crab (Dardanus pedunculatus) Xiaoliuqiu Island, Taiwan

Pascal Kobeh / Coral hermit crab (Paguritta / Orthopagurus harmsi), Sulu sea, Philippines

SCOTLAND: The Big Picture / Hermit crab (Pagurus bernhardus) on yellow sponge, Loch Etive, west coast of Scotland, UK, September.