Juergen Freund / Wide-angle timelapse of Sand bubbler crabs (Dotillidae) feeding, filtering detritus and plankton from sand and discarding the processed sand as pellets, which cover the beach, Wet Tropics World Herita...

Juergen Freund / Sand bubbler crabs (Dotillidae) feeding, filtering detritus and plankton from sand and discarding the processed sand as pellets, which cover the beach, Wet Tropics World Heritage Area, Cape Tribulatio...

Juergen Freund / Sand bubbler crab (Dotillidae) feeding, filtering detritus and plankton from sand and discarding the processed sand as pellets, which cover the beach, Wet Tropics World Heritage Area, Cape Tribulation...

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

Ernie Janes / Oystercatcher (Haematopus ostralegus) footprints on sand at low tide, Norfolk, England, UK, November.

Juergen Freund / Aerial of Simpson Desert Regional Reserve where lakes amongst the sand dunes. Normally dry, the lakes only have water during a very wet season, South Australia, June 2011

Ernie Janes / Holkham beach at low tide, Norfolk, UK August

Roland Seitre / Platypus (Ornithorhynchus anatinus) on wet sand, with crayfish. Captive. Healesville Sanctuary, Victoria, July.

Andrew Parkinson / Dunlin (Calidris alpina) adult trying to pull a worm out of the wet sand, September, Shetland Islands, UK, September.

Eric Baccega / Flowerpot sea stacks with outgoing tide at Hopewell Rocks. The world's highest tides. Bay of Fundy, New Brunswick, Canada, September 2010

Edwin Giesbers / Two Long-tailed / Crab-eating macaques (Macaca fascicularis) foraging on coastline at low tide, Bako National Park, Sarawak, Borneo, Malaysia

Solvin Zankl / An Olive ridley sea turtle hatchling (Lepidochelys olivacea) on its way to the sea. The hatchlings orientate themselves by the brightness of the horizon above the ocean, Ostional NP, Costa Rica. Octob...