David Noton / The road across the Piano Grande in winter. Monti Sibillini National Park, Umbria, Italy, February 2010.
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David Noton / The road to Ojo de Perdiz, high on the altiplano, Bolivia, December 2009
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Steven Kazlowski / Polar bear (Ursus maritimus) footprints in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska. October 2009
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Laurie Campbell / Wader footprints in sand, Aberlady Bay, Firth of Forth, Scotland, UK, December
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Jeff Vanuga / Native American Teepee rings on Table Mountain near Dubois, Shoshone reserve, Wyoming, USA, May 2009
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Merryn Thomas / Dusk on Old Quay, St. Martin's Flats, with buoy in shallows. St. Martin's, Isles of Scilly. England. May 2013.
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David Tipling / RF - King penguin (Aptenodytes patagonicus) foot prints in sand, St Andrew's Bay, South Georgia. January. (This image may be licensed either as rights managed or royalty free.)
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Kirkendall-Spring / Cross country ski tracks on Amabilis Mountain, Mount Baker-Snoqualmie National Forest, Washington, USA. December
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Pascal Tordeux / Tyre tracks in sand on beach as low tide, Crotoy, Somme Bay, Pas de Calais, France, July 2015.
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Lisa Hoffner / Elephant radio collars on the ground at sunrise, Samburu National Reserve, Kenya.
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Tui De Roy / Green turtle (Chelonia mydas) tracks from nesting females on beach, Galapagos
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Jouan Rius / Irregular ripples on gypsum sand dunes created by high winds, White Sands National Park, Chihuahuan Desert, New Mexico, USA, December 2012.