Nick Upton / Split level view of a Beadlet anemone (Actinia equina) attached to a boulder encrusted with Maerl (Lithothamnion glaciale) a red coralline alga, in a large rockpool, Crail, Scotland, UK, July

Peter Scoones / Sea anemone (Actinia equina) in kelp (Laminaria sp). England, UK, North Atlantic

Nick Upton / Beadlet anemone (Actinia equina) in a rock pool, Cornwall, UK, March.

Nick Upton / Beadlet anemone (Actinia equina) with tentacles spread to catch prey in currents. Rocky shore, South Devon, England, UK. September.

Robert Thompson / Beadlet anenome (Actinia equina) Ballywhoriskey Point, County Donegal, Northern Ireland, October.

Sue Daly / Close up of a Beadlet sea anemone (Actinia equina) showing acrorhagi stinging cells, red colour form, Sark, British Channel Islands, UK, July.

Sue Daly / Beadlet sea anemone (Actinia equina), red colour form, Sark, British Channel Islands, UK, July.

Sue Daly / Beadlet sea anemone (Actinia equina), orange colour form, Sark, British Channel Islands, UK, July.

Sue Daly / Colony of Beadlet sea anemones (Actinia equina), showing red, orange and green colour forms, Sark, British Channel Islands, UK, July.

Sue Daly / Beadlet sea anemone (Actinia equina), in both red and green colour forms, Sark, British Channel Islands, UK, July.

Nick Upton / Group of Dog whelks (Nucella lapillus) in an intertidal rock crevice among Acorn barnacles (Balanus perforatus) and Beadlet anemones (Actinia equina), Cornwall, UK, April.

Robin Chittenden / Beadlet anemone (Actinia equina) with Barnacles (Thoracica) Dog whelk (Nucella lapillus) Brittany, France. August 2014