Common hermit crab (Pagurus bernhardus), in a common whelk shell (Buccinum undatum) in a rockpool, The Gower Peninsula, Wales, United Kingdom, Europe

Hermit Crab Hydroid (Hydractinia echinata), on shell of Common hermit crab (Pagarus bernhardus), St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), clear view of pink & brown coloured hermit crab and shell with brittle starfish, St Abbs, Scotland, UK North Sea

Hermit Crab Hydroid (Hydractinia echinata), on Common Hermit Crab, St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), clear view of pink & brown coloured hermit crab in shell too big for crab, St Abbs, Scotland, UK North Sea

Hermit Crab Hydroid (Hydractinia echinata), on Common Hermit Crab, St Abbs, Scotland, UK North Sea

Hermit Crab Hydroid (Hydractinia echinata), on shell of Common hermit crab (Pagarus bernhardus), St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), clear view of pink & brown coloured hermit crab and shel with brittle starfishl, St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), clear view of pink & brown coloured hermit crab in shell too big for crab, St Abbs, Scotland, UK North Sea

Hermit Crab Hydroid (Hydractinia echinata), on shell of Common hermit crab (Pagarus bernhardus), St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), clear view of pink & brown coloured hermit crab in shell too big for crab, St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus berhardus), detail of head showing claws, eyes and antennae, St Abbs, Scotland, UK North Sea

Common Hermit Crab (Pagarus bernhardus), hermit crab's shell home has worm casts, sitting on sandy seabed, St Abbs, Scotland, UK