Sue Daly / Common lobster (Homarus gammarus) shovelling gravel out of a hole, Sark, British Channel Islands, UK, August.

Gerrit Vyn / Spotted seal (Phoca largha) pup resting on a the gravel beach of the Bering Sea. Chukotka, Russia. July.

Richard Steel / 2020VISION / Male Little ringed plover (Charadrius dubius) on the edge of a freshwater gravel pit, Hampshire, England, UK, April.

Radomir Jakubowski / Alpine / Trailing Azalea (Kalmia procumbens) growing on a scree slope. Rondane National Park, Norway, September. Winner, Fritz Polking Junior Award portfolio, GDT 2011 Competition.

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking beside lake, Kamchatka, Far east Russia, August

Jack Dykinga / Eroded formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the night sky...

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) pair spawning on gravel ground, Adams river, British Columbia, Canada, 1990

Wild Wonders of Europe / Roggo / Alpine newt (Triturus alpestris) chasing a ball of Water fleas in a gravel pit pool, Fribourg, Switzerland, June 2009

Roger Powell / Dunlin {Calidris alpina} sunbathing / warming itself on heated river gravel, Glen Kingie, West-Inverness, Scotland, UK

Jane Burton / Brown trout {Salmo trutta} one-week-old alevins on river gravel, captive, from Europe

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) group walking, pointing long bills on gravel beach, fall, Gold Harbour, South Georgia, Southern Ocean, Antarctic Convergence