Ross Hoddinott / Vehicle tracks in field of ripe Barley, farmland, late evening light, near Putford, Devon, UK. August 2012.

Ross Hoddinott / Field of ripe wheat with vehicle tracks, in late evening light, near Putford, north Devon, UK, August 2011.

Doug Wechsler / American toad (Bufo americanus) crossing road at night in front of car headlights, Philadelphia, Pennsylvania, USA, March

Peter Lewis / Light trails from a passing vehicle in the Laerdalstunnelen road tunnel, the longest of its type in the world. Norway, Europe. June 2009

Jim Brandenburg / Inuits dog sledding in midnight sun, Ellesmere Island, Nunavut, Canada

Ross Hoddinott / Vehicle tracks in field of ripe Barley, farmland, late evening light, near Putford, Devon, UK. August 2012.

Martin Dohrn / Martin Dohrn in night filming vehicle, on location for National Geographic Nightstalkers, Topi Plain, Masai Mara, Kenya. Image taken using a thermal camera, without artificial light. *THIS IMAGE CAN O...

Pete Oxford / Spanish Lynx (Lynx pardinus) researcher, Leonardo Fernandez Pena, radio tracking, Donana National Park, Huelva, Andalusia, Spain

Richard Du Toit / Fishermen in mokoro boat at sunrise, Chobe River, Namibia

Richard Du Toit / Fishermen in mokoro boat at sunrise, Chobe River, Namibia

Colin Monteath / Siberian Husky (Canis familiaris) group resting in polar midnight light, Greenland

Colin Monteath / Siberian Husky (Canis familiaris) resting in polar midnight light, Greenland