Robert Thompson / Dog whelk (Nucella lapillus) and Common barnacle (Semibalanus balanoides) on rock. Mill Quarter Bay, Killard Point National Nature Reserve, Strangford, County Down, Northern Ireland. February.

SCOTLAND: The Big Picture / Common whelk (Buccinum undatum) on maerl (Corallinales) bed, a priority marine feature. Within a Marine Protected Area, Shetland, Scotland, UK, September.

SCOTLAND: The Big Picture / Common whelk (Buccinum undatum) laying eggs, Loch Creran, Argyll and Bute, Scotland, UK, November. Small repro only.

Alex Hyde / Eggs of Common whelk (Buccinum undatum) on beach. Anglesey, Wales, UK. December.

Ann & Steve Toon / Hermit crab (Pagurus bernhardus) emering from whelk, Boulmer, Northumberland, UK, April

Sue Daly / Eggs of Common whelk (Buccinum undatum) on beach, Sark, British Channel Islands.

Sue Daly / Eggs of Common whelk (Buccinum undatum) on seaweed washed up on beach, Sark, British Channel Islands.

Sue Daly / Common whelk (Buccinum undatum) Bouley Bay, Jersey, British Channel Islands.

Nick Upton / Egg masses of Common whelk (Buccinum undatum) washed up on high water mark alongside dried out Bladder wrack fronds (Fucus vesiculosus), Rhossili, The Gower peninsula, Wales, UK, June.

Nick Upton / Dog whelk (Nucella lapillus), a predator of barnacles, on rocks encrusted with Common barnacles / Northern rock barnacles (Semibalanus balanoides) exposed at low tide, with seaweed, a rock pool and th...

Nick Upton / Head on view of Common Hermit crab (Pagurus bernhardus) in a Dog whelk shell crawling over floor of a rockpool. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae past Flat / Purple Top shell (Gibbula umbilicalis), Rough periwinkle (Littorina saxatilis) and Thick-li...

Toby Roxburgh / 2020VISION / Fishermen unloading bags of Common whelks (Buccinum undatum) at the harbour (The Cobb), Lyme Regis, England, UK, February 2011

Philippe Clement / Common whelk (Buccinum undatum) shells on beach, Brittany, France

Nick Upton / Common Mussels (Mytilus edulis) Dog Whelk (Nucella lapillus), Common limpet (Patella vulgata) and Montagu's stellate barnacles (Chthamalus montagui) exposed at low tide on rocks fringing a sandy beach...

Philippe Clement / Common whelk (Buccinum undatum) shells, Brittany, France

Philippe Clement / Common whelk (Buccinum undatum) from the North Sea, shell showing aperture, Belgium

Philippe Clement / Common whelk (Buccinum undatum) egg mass / sea wash ball, Belgium

Philippe Clement / Six Common whelk (Buccinum undatum) shells, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) shell from North Sea on beach, Belgium

Philippe Clement / Common whelk (Buccinum undatum) shell showing aperture, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) shell showing aperture, Normandy, France

Philippe Clement / Three Common whelk (Buccinum undatum) shells, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) from the North Sea, Belgium

Philippe Clement / Common whelk (Buccinum undatum) egg mass / sea wash ball, Belgium

Philippe Clement / Six Common whelk (Buccinum undatum) shells, Normandy, France

Philippe Clement / Three Common whelk (Buccinum undatum) shells on beach, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) shell, Normandy, France

Philippe Clement / Two Common whelk (Buccinum undatum) shells, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) shell, Normandy, France

Philippe Clement / Common whelk (Buccinum undatum) from North Sea on beach, Belgium

Philippe Clement / Collection of shells: Common Mussel (Mytilus edulis), Baltic tellin shell (Macoma balthica), Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Netted dog whelk (Nassarius retic...

Scott Leslie / Common Northern Whelk (Buccinum undatum) tending egg mass, Maine

Graham Eaton / Common whelk {Buccinum undatum} showing syphon, Wales, UK,

Graham Eaton / Common Hermit Crab (Pagurus bernhardus) in Whelk Shell, Cardigan Bay, Wales, UK 2007

Ingo Arndt / Common Northern Whelk (Buccinum undatum) shell length is approx seven centimeters, Helgoland, Germany

Ingo Arndt / Hermit Crab (Anapagurus laevis) in a snail shell from a Common Northern Whelk (Buccinum undatum) approximate length is nine centimeters, Helgoland, Germany

Ingo Arndt / Hermit Crab (Anapagurus laevis) in a snail shell from a Common Northern Whelk (Buccinum undatum) approximate length is nine centimeters, Helgoland, Germany

Ingo Arndt / Hermit Crab (Anapagurus laevis) in a snail shell from a Common Northern Whelk (Buccinum undatum) approximate length is nine centimeters, Helgoland, Germany

Niall Benvie / Young boy about to pick up a Common whelk shell {Buccinum undatum} UK.

Nick Upton / Common Hermit crab (Pagurus bernhardus) in a Dog whelk shell crawling over floor of a rockpool littered with shell fragments and grazing Flat top shells (Gibbula umbilicalis). Rhossili, The Gower Peni...

Nick Upton / Common Hermit crab (Pagurus bernhardus) in a Dog whelk shell and a Common prawn (Palaemon serratus) crawling over floor of a rockpool littered with mollusc shell fragments. Rhossili, The Gower Peninsu...

Ingo Arndt / Hermit Crab (Anapagurus laevis) in a snail shell from a Common Northern Whelk (Buccinum undatum) approximate length is nine centimeters, Helgoland, Germany

Duncan Usher / Flat Topshells (Gibbula umbilicalis), Common Northern Whelk (Buccinum undatum), and Common Periwinkle (Littorina littorea) shells

Ernie Janes / Common whelk (Buccinum undatum) shells on Titchwell Beach, Norfolk, UK. October 2018.

Ernie Janes / Common whelk (Buccinum undatum), Razor clam and other mollusc shells on Titchwell Beach, Norfolk, UK. October 2018.

Nick Upton / Head on view of Common Hermit crab (Pagurus bernhardus) in a Dog whelk shell crawling over the floor of a rockpool, Rhossili, The Gower Peninsula, UK, August.