Theo Bosboom / Star shaped sand pattern as photographed at low tide at Luskentyre beach, Lewis and Harris, Scotland, UK, October.

John Chan / Western gull (Larus occidentalis) feeding on a California two-spot octopus (Octopus bimaculoides) on a mudflat at low tide, Southern California, USA, November.

Duncan Murrell / Coral formations at low tide in Prony Bay in the Southern Lagoon, Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems UNESCO World Heritage Site. New Caledonia.

Pedro Narra / Aerial view of low tide in Sado estuary, Portugal. November

Juergen Freund / Timelapse of Periwinkle snails (Littoraria) climbing up Mangrove (Rhizophora) roots at lowtide, Daintree, Wet Tropics World Heritage Area, North Queensland, Australia.

Alex Hyde / Colony of Common Mussels (Mytilus edulis) growing on striated rock formation exposed at low tide. Cornwall, England, UK. Highly commended in the Coast and Marine Category of the British Wildlife Photo...

Theo Bosboom / Limpets (Patellidae) exposed at low tide on the coast of Playa de Ursa, Portugal. Finalist in the Animals in their Environment Category of the Wildlife Photographer of the Year Awards (WPOY) Competiti...

Ingo Arndt / King Penguin (Aptenodytes patagonicus) dispute on beach, Volunteer Point, Falkland Islands, February

Guy Edwardes / View over Pednvounder Beach towards Logan Rock, Porthcurno, Cornwall, England, UK. April 2009.

Ernie Janes / Low tide on the Wash, Snettisham, Norfolk, England, UK, February.

Sean Crane / Bat Star (Asterina miniata) trio at low tide, Montana De Oro State Park, Los Osos, California

Steven Kazlowski / Polar bear (Ursus maritimus) curious young bear approaching camera, over newly forming pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska