Kristel Richard / Two Cambodian Pony stallions play fighting, rearing on back legs, Siem Reap, Cambodia. March 2013
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Richard Du Toit / Burchell's Zebra (Equus burchellii) pair nuzzling, Rietvlei Nature Reserve, Gauteng, South Africa
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Jim Brandenburg / Pronghorn Antelope (Antilocapra americana) males facing off, South Dakota
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Tony Heald / Two African buffalo calves facing one another {Syncerus caffer} Kruger NP, South Africa
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Martin van Lokven / Asian Elephant (Elephas maximus) pair play-fighting, Kaudulla National Park, Sri Lanka
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Sean Crane / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, Wind Cave National Park, South Dakota
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Valeriy Maleev / Grey wolf (Canis lupus) standing facing in opposite directions, Astrakhan Steppe, Southern Russia.
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Ashley Cooper / Solar panels on the Isle of Eigg which relies exclusively on renewable energy. Scotland, UK. May 2012
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Ashley Cooper / An Eigg crofter and Eigg Electric employee next to their aray of solar PV panels. Isle of Eigg, Scotland, UK. May 2012
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Ashley Cooper / Solar panels and wind turbines on a farm near Woodhouse Eaves in Leicestershire, UK. March 2012
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Ashley Cooper / A farm house on the edge of Ilkley moor that has solar panels in the field behind the farmhouse to help power the house. West Yorkshire, UK. March 2012
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Ashley Cooper / Solar panels on a house roof in Ambleside in the snow, Lake District, UK. February 2012
