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

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...

Eric Baccega / Grizzly bear (Ursus arctos horribilis) mother and four spring cubs, walking along dirt track, Katmai National Park, Alaska, USA, July

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.

Nick Garbutt / Ox cart and Grandidier's Baobabs (Adansonia grandidieri) Near Morondava, western Madagascar.

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

Merryn Thomas / Four-wheel drive road trip through Salvador Dali Desert, Altiplano, Sur Lipez Province, Potosi Department, Bolivia. December 2013.

Hougaard Malan / Thunderclouds building over one of Namibia's many dirt roads. Southern Namibia. April 2014. Non-ex.

Richard Du Toit / Wild fire in the distance and scorched landscape, Marievale Bird Sanctuary, South Africa, June 2013

Wim van den Heever / Giraffe (Giraffa camelopardalis) walking along a road, Phinda Private Game Reserve, South Africa.

Wim van den Heever / Black rhinoceros (Diceros bicornis) crossing a road, Phinda Private Game Reserve, South Africa.

Wim van den Heever / African lioness (Panthera leo) looking at prey through foliage, Phinda Private Game Reserve, South Africa.

Wim van den Heever / Two Cheetahs (Acinonyx jubatus) on a track, Phinda Private Game Reserve, South Africa.

David Pattyn / Bengal tiger (Panthera tigris tigris) walking and being filmed by a National Geographic filming crew. Ranthambore National Park, Rajasthan, India, April 2012.

David Pattyn / Tourists in vehicle following and watching old female Bengal tiger (Panthera tigris tigris) Ranthambore National Park, Rajasthan, India.

Angelo Gandolfi / Wooden bridges on the Transpantaneira dirt road. Pantanal, Mato Grosso, Brazil, September 2010.

John Waters / A half-flooded tractor track heading towards inundated farmland on West Sedgemoor near Stoke St Gregory. Somerset Levels, Somerset, UK. January 2014

Peter Lewis / Rural road through the Poppy (Papaver rhoeas) fields. South Downs National Park, Arundel, West Sussex, England, UK. June.

Roger Powell / Cart tracks in a flowering meadow, with Cork oaks (Quercus suber) in the background, Beja, Portugal, April.

Tony Phelps / Leopard tortoise (Stigmachelys pardalis) crossing a road with a car approaching, Swartberg Mountains, Western Cape, South Africa.

Ernie Janes / Top soil blowing from coastal fields during dry weather Sherringham, Norfolk, April

Jabruson / Vehicles stuck in deep mud - the onset of the rainy season deteriorates dirt roads making transport difficult, Cameroon, August 2009.

Jabruson / Vehicles stuck in deep mud - the onset of the rainy season deteriorates dirt roads making transport difficult, Cameroon, August 2009.

Wild Wonders of Europe / Widstrand / Couple walking down dirt road in Sfinthu Gheorghe, Danube delta rewilding area, Romania, June 2012

Enrique Lopez-Tapia / Dirt road through Niokolo Koba National Park, Senegal, UNESCO World Heritage site.

Charlie Summers / Giraffe (Giraffa camelopardalis) drinking from fresh water puddle in a dirt track after rain storm, Central Kalahari, Botswana

Charlie Summers / Flap necked chameleon (Chamaeleo dilepis) crossing dirt road, Tarangire National Park, Tanzania

Mark Taylor / Remote dirt track stretching towards mountains on a distant horizon. Route 40, Argentina, Patagonia, South America, March 2010.

Mark Taylor / Remote dirt track and rainbow. Route 40, Argentina, Patagonia, South America, March 2010.

Daniel Heuclin / Aerial view of logging area by a dirt road in primary forest. French Guyana, August 2008.

Tony Phelps / Restone Hills with dirt track and small building, near Calitzdorp, Little Karoo, South Africa, July 2010

Gerrit Vyn / Common Pauraque (Nyctidromus albicollis) adult, gray morph of the subspecies N. a. merrilli. These birds are often seen perched on dirt roads at night. Starr County, Texas

Onne van der Wal / Upaved road and mountains, South Africa. December 2008.

David Noton / Dirt track through sugar cane plantation, nr Kendal, central Barbados

David Noton / Dirt track through sugar cane plantation, nr Kendal, central Barbados

David Noton / Dirt road above Bunyerro Gorge, Flinders Ranges, South Australia, Australia

Doug Allan / Aerial view of barren landscape and a solitary dirt road through the altiplano at 4500m, Bolivia, South America

Roberto Rinaldi / Four-wheel drive jeep on dirt road at Torre del Porticciolo, Sardinia.

Roberto Rinaldi / Four-wheel-drive pick up truck stuck in the mud on dirt road, central Babelthaup, Palau. Micronesia.

Roberto Rinaldi / Small dirt roads on central Babelthoup, the main island of Palau. Miconesia.