Doc White / California sea otter (Enhydra lutris) feeding on Northern kelp crab, Monterey Bay, California, USA, Eastern Pacific Ocean, May

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

Wild Wonders of Europe / Lundgren / Long-legged spider crab (Macropodia rostrata) on a new kelp leaf, Moere coastline, Norway, February 2009

Georgette Douwma / Edible crab (Cancer pagurus) in kelp, St. Abbs, North Sea, Atlantic Ocean.

Ralph Pace / Pelagic Red Crab (Pleuroncodes planipes) group on kelp, indicators of El Nino, California

Doc White / California sea otter (Enhydra lutris) feeding on Northern kelp crab, Monterey Bay, California, USA, Eastern Pacific Ocean, May

Alex Mustard / A large Puget Sound king crab (Lopholithodes mandtii) 50cm across in kelp. Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Alex Mustard / Maroon hermit crab / gold ring hermit crab (Pagurus hemphilli) climbs on a kelp leaf, covered in colonial seamatts. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. North East Pa...

MYN / Les Meade / Graceful Kelp Crab (Pugettia gracilis) Meadowdale Beach, Puget Sound, Snomish County, Washington, June, meetyourneighbours.net project

Graham Eaton / Spiny Spider Crab (Maja squinado) mating in Kelp, Abersoch, Wales, December

Franco Banfi / Kelp crab (species unknown) Arctic circle Dive Center, White Sea, Karelia, northern Russia

Jeff Rotman / Cryptic Kelp Crab (Pugettia richii) and Plumose Anemones (Metridium giganteum). Vancouver Island, British Columbia, Canada, Pacific Ocean

Solvin Zankl / Great spider crab (Hyas araneus) on Kelp (Laminaria hyperborea), Atlantic Ocean, North West Norway

Nick Upton / Edible crab (Cancer pagurus) well camouflaged among holdfasts of Tangleweed kelp (Laminaria digitata), partially exposed on a low spring tide, North Berwick, East Lothian, UK, July.

Nick Upton / Edible crab (Cancer pagurus) well camouflaged among holdfasts of Tangle kelp (Laminaria digitata), exposed on a low spring tide, North Berwick, East Lothian, UK, July.

Kevin Schafer / Marine otter (Lontra felina) mother and cub feeding on crab in kelp, Chiloe Island, Chile, Endangered species

Graham Eaton / Spiny Spider Crab (Maja squinado) on a kelp covered pinnacle, in a rockpool, Abersoch, Wales, UK. May.

Graham Eaton / Spiny Spider Crab (Maja squinado) amongst kelp, Cardigan Bay, Wales, UK, June

Wild Wonders of Europe / Lundgren / Common hermit crab (Pagurus barnharudus) on Kelp with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) growing on it, Lofoten, Norway, November 2008

Wild Wonders of Europe / Lundgren / Common hermit crab (Pagurus barnharudus) on Kelp, Lofoten, Norway, November 2008

Matthias Breiter / Sea Otter (Enhydra lutris) feeding on crab amid kelp, Kodiak, Alaska

Flip Nicklin / Kelp Crab (Pugettia producta) on Kelp (Macrocystis pyrifera) underwater, Clayoquot Sound, Vancouver Island, British Columbia, Canada

Flip Nicklin / Kelp Crab (Pugettia producta) on Kelp (Macrocystis pyrifera) underwater, Clayoquot Sound, Vancouver Island, British Columbia, Canada

Ralph Pace / Pelagic Red Crab (Pleuroncodes planipes) group on kelp, indicators of El Nino, California

Agustin Esmoris / Kelp Gull (Larus dominicanus) feeding on crab carcass, Bahia Blanca, Argentina

Scott Leslie / Atlantic Rock Crab (Cancer irroratus) and Acadian Hermit Crab (Pagurus acadianus) on kelp, Bay of Fundy, Maine

Flip Nicklin / Kelp Crab (Pugettia producta) on Kelp (Macrocystis pyrifera) underwater, Clayoquot Sound, Vancouver Island, British Columbia, Canada

Lewis Jefferies / Common hermit crab (Pagurus bernhardus) in Painted topshell, resting on Golden kelp (Laminaria ochroleuca) frond, encrusted with Lacy crust bryozoans (Membranipora membranacea), Lizard Peninsula, Corn...

Alex Mustard / Sharpnose crab (Scyra acutifrons) male, crawling along the stipe of a Palm kelp (Eisenia arborea), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Shane Gross / Kelp crab (Pugettia producta) resting on Giant kelp (Macrocystis pyrifera), off Port Hardy, Vancouver Island, British Columbia, Canada, Pacific Ocean.

Henley Spiers / Velvet swimming crab (Necora puber) hiding among kelp fronds, Shetland, Scotland, UK, North Sea. July.

Shane Gross / Graceful kelp crab (Pugettia gracilis) holding on to Giant plumose anemone (Metridium farcimen), Prince William Sound, Alaska, USA, Pacific Ocean.

Shane Gross / Longhorn decorator crab (Chorilia longipes) clinging to underside of kelp (Laminariales), Prince William Sound, Alaska, USA, Pacific Ocean.

Shane Gross / Northern kelp crab (Pugettia producta) clinging to kelp (Laminariales), with Eelgrass (Zostera marina) in background, Prince William Sound, Alaska, USA, Pacific Ocean.

Lewis Jefferies / Spider crab (Maja brachydactyla) camouflaged with a covering of algae, clinging on to kelp frond and feeding, Lizard Peninsula, Cornwall, UK, English Channel. May.

Henley Spiers / Pair of Velvet swimming crabs (Necora puber) mounted on top of one another whilst clinging to strand of kelp, Farne Islands, Northumberland, England, UK, North Sea, September.

Franco Banfi / Snow crab (Chionoecetes opilio) resting on kelp, Trondheimfjord, Norway, North Atlantic Ocean.

Alex Mustard / Spider crab (Hyas sp.) scaling the stipe of Cuvie kelp (Laminaria hyperborea) up into the canopy of the kelp forest. Loch Carron, Highlands, Scotland, UK.

Alex Mustard / Common hermit crab (Pagurus bernhardus) feeding on a Flame shell (Limaria hians) in a kelp (Laminaria hyperborea) forest, Loch Carron, Highlands, Scotland, UK..

Alex Mustard / Edible crab (Cancer pagurus) in a kelp forest, Loch Carron, Highlands, Scotland, UK.

Alex Mustard / Spider crab (Hyas sp.) feeding on a Flame shell (Limaria hians) while climbing on a kelp stipe, Loch Carron, Highlands, Scotland, UK.

Alex Mustard / Hermit crab (Pagurus pubescens) crawling on a kelp (Laminaria hyperborea) stipe, Loch Duich, Highands, Scotland, UK.

Alex Mustard / Large Spider crab (Maja brachydactyla) in front of Cuvie kelp (Laminaria hyperborea), Porthkerris, Cornwall, UK, English Channel.

Alex Mustard / RF - Great spider crab (Hyas araneus) clinging to a blade of Kelp (Laminaria hyperborea) billowing in the current. Loch Carron, Scotland, UK. (This image may be licensed either as rights managed or ro...

Alex Mustard / Edible crab (Cancer pagurus) sheltering in white soft corals , Dead man's fingers (Alcyonium digitatum) beneath kelp (Laminaria hyperborea). St Abbs, Eyemouth, Berwickshire, Scotland, United Kingd...

Alex Mustard / Great spider crab (Hyas araneus) covered in algae, climbing up onto a frond of kelp (Laminaria hyperborea). Lochcarron, Ross-shire, Ross and Cromarty, Highlands, Scotland, United Kingdom. British Isle...

Alex Mustard / Edible crab (Cancer pagurus) beneath kelp (Laminaria sp.). Lochcarron, Ross-shire, Ross and Cromarty, Highlands, Scotland, United Kingdom. British Isles. Loch Carron, North East Atlantic Ocean.

Shane Gross / Northern kelp crab (Pugettia producta) clinging to a fallen tree branch off Vancouver Island, British Columbia, Canada.

Alex Mustard / Brown crab (Cancer pagurus) nestled amongst soft corals, Dead man's fingers (Alcyonium digitatum), beneath cuvie kelp forest (Laminaria hyperborea). St Abbs, Eyemouth, Berwickshire, Scotland, Unit...

Alex Mustard / Reef scene with large colonies of orange and white Dead man's fingers (Alcyonium digitatum), two swimming crabs - Velvet swimming crab (Necora puber) and a common sea urchin (Echinus esculentus, b...

Shane Gross / Atlantic rock crab (Cancer irroratus) sheltering in Kelp. Newfoundland, Canada. May.

Shane Gross / Atlantic rock crab (Cancer irroratus) sheltering in Kelp. Newfoundland, Canada. May.

David Hall / Northern kelp crab (Pugettia producta) large adult male is clinging to strands of bull kelp (Nereocystis luetkeana). Nigei Island, Queen Charlotte Strait, British Columbia. September.

Shane Gross / Kelp crab (Pugettia producta) feeding on Giant kelp (Macrocystis pyrifera) off San Diego, California, USA

Shane Gross / A kelp crab (Pugettia producta) feeding on Giant kelp (Macrocystis pyrifera) off San Diego, California, USA. Non-ex