Nick Upton / Common starfish (Asterias rubens) moving in a rockpool, real time, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) and a Rock goby (Gobius paganellus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Rock goby (Gobius paganellus) stealing food from a scavenging Common prawn (Palaemon serratus) in a rockpool, Cornwall, England, UK, September.

Christophe Courteau / Edible crab in tide pool split level {Cancer pagurus} Brittany France

Alex Hyde / Various rockpool animals and seaweeds, photographed on a white background. Isle of Skye, Inner Hebrides, Scotland, UK, March. Digital composite.

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

Ross Hoddinott / Godrevy Lighthouse at sunset, seen through rocksand rockpool in the foreground. Nr Hayle, Cornwall, UK, June 2009

Graham Eaton / Velvet swimming crab (Necora puber) pair mating, Trefor, Wales, UK, July.

Dan Burton / Young girl fishing in a tidepool on Exmouth Beach, Devon, UK, September 2009, Model released.

Dan Burton / Children checking their bucket for animals caught in a tidepool on Exmouth Beach, Devon, UK, September 2009, Model released.

George Sanker / Rockpool and Seaweed covered rocky shore at dawn. Acadia National Park, Maine, USA. October 2013.

Ross Hoddinott / Godrevy lighthouse and rockpool, high tide at sunset, Gwithian, Cornwall, UK. October 2018.