Ann & Steve Toon / Dust devil in Amboseli National Park in dry season, Kenya, October 2012

Christophe Courteau / Mountain Gorilla (Gorilla beringei) female holding baby in dense vegetation in Volcanoes National Park, Rwanda, at an altitude of 3000m, short dry season, February

Christophe Courteau / Mountain gorilla (Gorilla beringei) baby in mother's arms. 3000 metres above sea level in Volcanoes National Park, Rwanda. Short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) dominant male silver back sitting amongst vegetation. 2700 metres above sea level in Volcanoes National Park, Rwanda. short dry season, February

Juan Carlos Munoz / Aerial view dry river bed in the Namib desert, Sossusvlei, Sesriem, Namibia, August 2008

Ben Osborne / Aerial view of African elephants (Loxodonta africana) find shade under trees to avoid midday sun, during a drought. Northern Botswana. Taken on location for BBC Planet Earth series, October 2005

Ben Osborne / African elephants (Loxodonta africana) bulls crowd into an emptying waterhole to drink, Savuti, Botswana. Taken on location for BBC Planet Earth series, 2005

Christophe Courteau / Kalahari bushmen, family playing traditional game, dry season, Central Kalahari Desert, Botswana, August 2008

Christophe Courteau / Kalahari bushmen, family sitting round fire in the bush, dry season, Central Kalahari Desert, Botswana, August 2008

Christophe Courteau / Kalahari bushman drinking water by squeezing root fibers that are rich in water, dry season, Central Kalahari Desert, Botswana, August 2008

Christophe Courteau / 'Xamse', a young Kalahari bushman, drinking water from an ostrich's egg in the dry season, egg was buried underground during the rainy season, Kalahari Desert, Botswana, August 2008

Christophe Courteau / 'Xamse', a young Kalahari bushman, drinking water from an ostrich's egg in the dry season, egg was buried underground during the rainy season. Kalahari Desert, Botswana, August 2008

Juan Carlos Munoz / Aerial view of the trench of the Great Rift valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of Lake Natron, Rift Valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of Lake Natron, Rift Valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of African elephants (Loxodonta africana) mother and calf walking through desert landscape, Amboseli National Park, Kenya, Africa, August 2009

Juan Carlos Munoz / Aerial view of a flock of Lesser Flamingos (Phoeniconaias minor) wading in Lake Natron, with sediment trails, Rift Valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of a flock of Lesser Flamingos (Phoeniconaias minor) wading in Lake Natron, with sediment trails, Rift Valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of nursery of Lesser Flamingos (Phoeniconaias minor) on Lake Natron, Rift Valley, Tanzania, Africa, August 2009

Juan Carlos Munoz / Aerial view of Maasai fenced homestead, with buildings and livestock enclosures. Kenya, Africa, August 2009

Juan Carlos Munoz / Aerial view of flock of Lesser Flamingos (Phoeniconaias minor) wading in Lake Magadi, with sediment trails, Rift Valley, Kenya, Africa, August 2009

Juan Carlos Munoz / Aerial view of flock of Lesser Flamingos (Phoeniconaias minor) flying low over Lake Magadi, Rift Valley, Kenya, Africa, August 2009

Richard Du Toit / Fire in dry season burning agricultural fields, Western Cape, South Africa

Richard Du Toit / Fire in dry season, Western Cape, South Africa

David Woodfall / Drought affected agricultural land, monsoon wind blowing top soil from fields, Madhya Pradesh, India, Asia

David Woodfall / Villagers living in former river bed now dry due to siltation, complex effects of climate change, Ganges delta, Bangladesh, November 2008

Warwick Sloss / Hippotamus {Hippopotamus amphibius} large group wallowing in a drying river bed, Katavi National Park, Tanzania, December.

Jack Dykinga / Willcox Playa, a normally dry lake, after rain, sunrise, Chiricahua and Swisshelm Mountains in the distance, Arizona, USA

Jack Dykinga / Paria Canyon's walls with mud patterns indicating former river channel, Navajo sandstone, Vermilion Cliffs National Monument, Arizona, USA

Wild Wonders of Europe / Smit / Great pond snail (Lymnaea stagnalis) trying to survive in ponds in broadleaf forest during dry season, Gornje Podunavlje Special Nature Reserve, Serbia, June 2009

Fiona Rogers / Wild mature male mandrill (Mandrillus sphinx) in gallery forest during dry season. Lope National Park, Gabon. June 2008.

Anup Shah / Young male wild Mandrill (Mandrillus sphinx) in tree. Gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Mature male wild Mandrill (Mandrillus sphinx) walking through gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Mature Male wild Mandrill (Mandrillus sphinx) walking through gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Wild mature male Mandrill (Mandrillus sphinx) walking through gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Lesser flamingo {Phoeniconaias minor} solitary chick on lake shore with no water, Lake Nakuru NP, Kenya

Anup Shah / Lesser flamingo {Phoeniconaias minor} solitary chick on lake shore with no water, Lake Nakuru NP, Kenya

Jouan & Rius / Bush fire during dry season, Northern Territory, Australia

Jouan & Rius / Bush fire during dry season, Northern Territory, Australia

Theo Allofs / Bengal Tiger (Panthera tigris tigris) 11 months old cub walking on rocky ledge in front of red cliff, April, dry season, Bandhavgarh National Park, India

Richard Du Toit / Burchell's Zebra (Equus burchellii) herd crossing pan during summer dry season, Makgadikgadi Salt Pans, Botswana

Anup Shah / Aerial view of bush fire in woodland savanna during dry season, Katavi National Park, Tanzania

Jabruson / Grass fire started by poachers in the dry season, in attempt to drive wildlife out for them to hunt, Rwindi plains, Virunga NP, Democratic Republic of Congo (formerly Zaire)

Anup Shah / Wildebeest (Connochaetes taurinus) feeding on plains of Serengeti NP wiht big sky, Tanzania

Luiz Claudio Marigo / Toborochi tree {Chorisia insignis} in Gran Chaco NP, Bolivia, chaco vegetation

Martha Holmes / Group of Hippopotamuses in river (Hippopotamus amphibius) Luangwa River, Zambia, Africa.

Martha Holmes / Cape buffalo {Syncerus caffer caffer} large herd drinking in Luangwa river, Zambia.

Luiz Claudio Marigo / Migrant family from the drought region of NE Brazil

Rolf Nussbaumer / Checkered garter snake {Thamnophis m marcianus} on dry cracked mud, Texas, USA.

Mitsuaki Iwago / African Lion (Panthera leo) pride on cracked mud in dry season, Serengeti National Park, Tanzania

Yva Momatiuk & John Eastcott / Organ Pipe Cactus (Stenocereus thurberi) with many stalks, spring evening, during drought year, Organ Pipe Cactus National Monument, Arizona

Tim Fitzharris / Snowy Owl (Nyctea scandiaca) amid dry grass, British Columbia, Canada

Tui De Roy / Blue-footed Booby (Sula nebouxii) couple courting in the dry season, Eden Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) old male in dry season on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Gertrud & Helmut Denzau / Domestic Bactrian camel {C. bactrianus} lying down to reach water at spring, Mongolia.

Anup Shah / Savanna with Acacia trees, and line of trees marking seasonal water course. Masai Mara, Kenya East-Africa. End of dry season

Jabruson / Sand storm predeeding first rains in Tsavo East NP, Kenya.

Mark Payne-Gill / African bullfrog / Giant bullfrog /Pixie frog (Pyxicephalus adspersus) male digs canal to rescue tadpoles from drying puddle, South-Africa. Second prize winner in this Wildlife Photographer of the Ye...

Tony Heald / African elephant walking {Loxodonta africana} herd in background, Etosha NP, Namibia

Richard Du Toit / Fire during dry Season, Kruger National Park, Limpopo, South Africa

Richard Du Toit / Fire during dry Season, Kruger National Park, Limpopo, South Africa

David Pattyn / American Wood Ibis (Mycteria americana) feeding on catfish in a drying pool, at the end of the dry season lots of herons of different species gather to feed on the exposed fish. Southern Pantanal, Mat...

David Pattyn / Jabiru Stork (Jabiru mycteria) feeding on catfish in a drying pool, at the end of the dry season lots of herons of different species gather to feed on the exposed fish. Southern Pantanal, Mato Grosso...

David Pattyn / American Wood Ibis (Mycteria americana) feeding on catfish in a drying pool, at the end of the dry season lots of herons of different species gather to feed on the exposed fish. Southern Pantanal, Mat...

David Pattyn / American Wood Ibis (Mycteria americana) feeding on catfish in a drying pool, at the end of the dry season lots of herons of different species gather to feed on the exposed fish. Southern Pantanal, Mat...

Anup Shah / Common zebra (Equus quagga) herd standing in a dust storm caused by extreme wind in the dry season, Masai Mara National Reserve, Kenya. March

Jabruson / Slash and burn agricultural activity outside the town of Bayanga, ironically where headquarters for Dzanga-Ndoki National Park is located, Southern Central African Republic, March 2012. Forest cleara...

Christophe Courteau / Two African wild dogs (Lycaon pictus) showing affection, Okavango Delta during the dry season, Botswana

Christophe Courteau / Pack of African wild dogs (Lycaons pictus) interacting on the Okavango Delta during the dry season, Botswana

Christophe Courteau / Two African wild dogs (Lycaon pictus) showing affection, Okavango Delta during the dry season, Botswana

Christophe Courteau / Two African wild dogs (Lycaon pictus) walking / stalking beside waterhole, Okavango Delta during the dry season, Botswana

Christophe Courteau / Pack of African Wild Dogs (Lycaon pictus) in the Okavango Delta during the dry season, just before the rain, Botswana

Christophe Courteau / African wild dog (Lycaons pictus) from behind, on the Okavango Delta during the dry season, Botswana

Christophe Courteau / African wild dog (Lycaons pictus) from behind, on the Okavango Delta during the dry season, Botswana

Christophe Courteau / African wild dog (Lycaon pictus) portrait, Okavango Delta during the dry season, Botswana

Christophe Courteau / Three African wild dogs (Lycaons pictus) from behind, on the Okavango Delta during the dry season, Botswana

Christophe Courteau / Two African wild dogs (Lycaon pictus) resting, Okavango Delta during the dry season, Botswana

Christophe Courteau / African wild dogs (Lycaon pictus) relaxing beside waterhole, one stretching. Okavango Delta during the dry season, Botswana

Christophe Courteau / Pack of African wild dogs (Lycaon pictus) relaxing beside waterhole, Okavango Delta during the dry season, Botswana

Christophe Courteau / African wild dog (Lycaon pictus) watching elephants, Okavango Delta during the dry season, Botswana

Christophe Courteau / Mountain Gorilla (Gorilla beringei) behind tree eating bark, with only hands visible. Volcanoes National Park, Rwanda. Altitude of 2700m, Short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) hand on tree, Volcanoes National Park, Rwanda. Altitude of 2700m, short dry season, February

Christophe Courteau / Mountain gorilla (Gorilla beringei) baby sitting on mother's lap. 2700 metres above sea level in Volcanoes National Park, Rwanda. Short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) young male of the Sabyinyo Group, at rest in thick bamboo forest at an altitude of 2700m. Dry Season, February. Volcanoes National Park, Rwanda

Christophe Courteau / Mountain Gorilla (Gorilla beringei) young male resting in bamboo forest. Volcanoes National Park, Rwanda. Altitude of 2700m, short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) young male showing teeth, Volcanoes National Park, Rwanda. Altitude of 2700m, Short dry season, February

Christophe Courteau / Black back Mountain Gorilla male (Gorilla beringei) and tracker. The Sabyinyo group lives at an altitude of 2700m in the Volcanoes National Park, Rwanda. Dry season, February

Christophe Courteau / Flood plain of the Okavango Delta during the Dry Season, Botswana

Christophe Courteau / Mountain Gorilla (Gorilla beringei) female portrait, Volcanoes National Park, Rwanda. Altitude of 3000m, Short dry season, February

Christophe Courteau / Pack of Wild Dogs {Lycaon pictus} at end of the dry season, Northern Okavango Delta, Botswana

Christophe Courteau / Young Mountain gorilla (Gorilla beringei)suckling from mother, amongst bamboo in the Volcanoes National Park, Rwanda. Altitude of 3000m, Short dry season, February

Christophe Courteau / The Okavango River penetrates the flood plain of the Okvango Delta during the dry season, Botswana

Christophe Courteau / Mountain Gorilla (Gorilla beringei) adult male black back feeding in dense vegetation in Volcanoes National Park, Rwanda, at an altitude of 3000m, short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) dominant male silver back eating leaves, 2700 metres above sea level in Volcanoes National Park, Rwanda. Short dry season, February

Christophe Courteau / Mountain Gorilla (Gorilla beringei) female moving amongst vegetation, Volcanoes National Park, Rwanda. Altitude of 3000m, short dry season, February

Christophe Courteau / The Okavango River penetrates the flood plain of the Okvango Delta during the dry season, Botswana