Floris van Breugel / Giant Red Sea Urchins (Strongylocentrotus franciscanus) Purple sea urchins (Strongylocentrotus purpuratus) and Sea Anenomes (Anthopleura) underwater, in tide pools along Californian coastline, USA.

Konrad Wothe / Giant Green Sea Anemone (Anthopleura xanthogrammica) group, Goose Barnacles (Lepas anserifera) group and Ochre Sea Stars (Pisaster ochraceus) at low tide, Olympic National Park, Washington

Floris van Breugel / Tide pool full of Giant green anemones (Anthopleura xanthogrammica) at low tide, Olympic National Park, Washington, USA, March.

Kirkendall-Spring / Giant green anemone (Anthopleura xanthogrammica) in tide pool, Olympic National Park, Washington, USA, June

Matthias Breiter / Giant Green Sea Anemone (Anthopleura xanthogrammica) group and Ochre Sea Stars (Pisaster ochraceus) on rock wall on St. Lazaria Island, Alaska

Konrad Wothe / Giant Green Sea Anemone (Anthopleura xanthogrammica) group and Ochre Sea Stars (Pisaster ochraceus) at low tide, Olympic National Park, Washington

Konrad Wothe / Giant Green Sea Anemone (Anthopleura xanthogrammica) group, Goose Barnacles (Lepas anserifera) group and Ochre Sea Stars (Pisaster ochraceus) at low tide, Olympic National Park, Washington

Konrad Wothe / Giant Green Sea Anemone (Anthopleura xanthogrammica) group in tidepool, Olympic National Park, Washington

Nick Upton / 'Warrior' Aggregating anemones fighting {Anthopleura elegantissima} california, USA

Rob Tilley / Giant Green Anemones, Rialto Beach, Olympic NP, Washington, USA

Dan Burton / Pimplet sea anemone {Anthopleura ballii} in rock pool, Cornwall, UK

GEORGETTE DOUWMA / Rockpool at low tide with Giant green anemones {Anthopleura xanthogrammica} and Ochre sea stars {Pisaster ochraeceus} Olympic National Park, Washington, USA.