Floris van Breugel / Driving the remote dirt roads, 11000ft altitude, White Mountains, California, USA, June

Juan Carlos Munoz / Tourists hiking along dirt track, Triglav National Park, Julian Alps, Slovenia, October 2010.

Thomas Marent / Indian Rhinoceros (Rhinoceros unicornis) crossing road near tourists, Kaziranga National Park, Assam, India

Thomas Marent / African Elephant (Loxodonta africana) crossing dirt road near tourists, Serengeti National Park, Tanzania

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) troop walking down dirt road, vulnerable, Berenty Private Reserve, Madagascar

Jabruson / African rainforest transport penetration. Road and associated infrastructure development difficulties. The onset of the rainy season deteriorates dirt roads and vehicles get stuck in mud, Cameroon, Au...

Christophe Courteau / Pantaneiros horsemen leading cattle and horse livestock along the Transpantaneira, Pantanal, Brazil, July 2008

Christophe Courteau / Two African lion cubs (Panthera leo) playing on a road in the Kalahari Desert, Botswana.

Pete Oxford / Road runnning through rainforest, Iwokrama Rainforest Reserve, Guyana

Vincent Grafhorst / Dirt track through the grassy plains, Makgadikgadi, Botswana

John Waters / Banded Mongoose (Mungos mungo) group on the move, crossing a track at Mweya Lodge, Queen Elizabeth National Park, Uganda, E. Africa

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) pair of spring cubs, Denali National Park and Preserve, Alaska