Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi), Alcedo Volcano, Isabela Island. This is where the largest extant population exists, acting as ecosystem engineers by maintaining open meadows and digg...

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Denis-Huot / Blue wildebeest (Connochaetes taurinus), migrating herd silhouetted on the horizon at sunset, Masai Mara Game Reserve, Kenya

Floris van Breugel / California poppies (Eschscholzia californica) and California goldfields (Lasthenia californica) extend as far as the eye can see, Antelope Valley Poppy Preserve, California, USA

Inaki Relanzon / Elm tree (Ulmus) in Gobi desert, South Mongolia.

Gerrit Vyn / Rain showers over sagebrush-steppe at the foot of the Sawtooth Mountains. Clark County, Idaho, USA, June.

Inaki Relanzon / Animal petroglyphs between 5,000-15,000 years old years ago, Khavtsgait Petroglyph Mountain, Gobi desert, Govi Gurvan Saikhan National Park, South Mongolia. June 2015.

Mark Bowler / Aerial view of Yavari-Mirin River and oxbow lake and Amazon Rainforest, Peru, July.

Mark Bowler / Aerial view of Amazon River, with settlements and secondary rainforest, near Iquitos, Peru. July 2015.

Juan Carlos Munoz / Partially harvested Lavender (Lavendula angustifolia) fields, Valensole Plateau, Alpes Haute Provence, France, July 2015.

Juan Carlos Munoz / Aerial view of Delta Sierpe River Terraba, Corcovado National Park, Osa Peninsula, Puntarenas Province, Costa Rica. December 2014.

Sergey Gorshkov / Gemsbok (Oryx gazella) in sand dunes, Namibia. Finalist in the Mammals Category of the Wildlife Photographer of the Year Awards (WPOY) Competition 2015.

Eric Baccega / Sulphur formation, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Sven Zacek / Autumn trees on the Rapa River Delta, aerial view, Rapadalen Sarek National Park, Sweden, September 2009.

Sven Zacek / Broken ice covered in snow at sunset, on the shore of Lake Vortsjarv, gathered to shore by extreme winds, Estonia. December 2014.

Bruno D'Amicis / Sand viper (Cerastes vipera) sidewinding on sand dunes. Grand Erg Oriental, Kebili Governorate. Tunisia.

Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA, August 2015. Long exposure with lightning trigger.

Konstantin Mikhailov / Desert landscape with lakes in Pamir's Plateau at 4000m, Pamir Mountains, Tajikistan. June 2014.

Andy Rouse / Fish eye aerial view of autumnal forest, Finland, September.

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) school off the coast of False Bay, with dramatic sky, South Africa, May.

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) school porpoising, False Bay, South Africa

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) school near the water?s surface, False Bay, South Africa

Ole Jorgen Liodden / Polar bear (Ursus maritimus) walking across vast ice floe, Spitsbergen, Svalbard, July 2013.

Ole Jorgen Liodden / Ice cliff of the Austfonna ice cap with melt water and ice crashing down to the sea, Svalbard, Norway, July 2012.

Klein & Hubert / Colony of King penguin (Aptenodytes patagonicus) chicks at sunset, South Georgia, Antarctica.

Steven Kazlowski / Photographer in front of Northern lights / Aurora borealis glowing brightly over the frozen eastern Beaufort Sea, Arctic National Wildlife Refuge, Alaska Model released.

Orsolya Haarberg / High angle view of person walking on frozen lake of cracked ice. Lofoten Isands, Norway. January. Highly commended in the Landscape Category of the Oasis Photography Competition 2017. Highly commended...

Floris van Breugel / Bald eagle (Haliaeetus leucocephalus) flying in front of the massive wall of ice, Margerie Glacier, Glacier Bay National Park, Alaska, USA, August 2014.

Denis-Huot / Aerial view of African elephants (Loxodonta africana) and African buffalo (Syncerus caffer) at a water hole during the dry season, Tsavo East National Park, Kenya. October.

Denis-Huot / Male black rhinoceros (Diceros bicornis) silhouetted against clouds, Masai-Mara Game Reserve, Kenya. March.

Denis-Huot / Bushfires in dry season on the Isuria escarpment, Masai-Mara Game Reserve, Kenya. October 2007.

Denis-Huot / African elephant (Loxodonta africana) herd walking in the plains during the dry season, Masai-Mara Game Reserve, Kenya. October.

Pal Hermansen / Aerial view of river delta, South West Iceland, June 2014.

David Noton / Dawn over the mountains and Nam Song River at Vang Vieng, Laos, March 2009.

Denis-Huot / Lioness (Panthera leo) and Thomson's gazelles (Eudorcas thomsonii) silhouetted at sunset, Masai-Mara game reserve, Kenya.

Denis-Huot / Cheetah (Acinonyx jubatus) female standing below dark storm clouds, Masai-Mara game reserve, Kenya.

Staffan Widstrand / American Bison (Bison bison) herd in habitat, Yellowstone National Park, Wyoming, USA, October.

Wild Wonders of Europe / Bartocha / Piano Perduto, Monti Sibillini National Park, Italy, May, 2009.

Steve O. Taylor (GHF) / Rocky landscape of northern Niger, 2005.

Hougaard Malan / Perito Moreno glacier viewed over bright autumn foliage, Patagonia, Argentina. April 2013. Non-ex.

Hougaard Malan / View from a high dune across desert landscape in morning light. Namib Rand, Namibia. April 2012.

Ross Hoddinott / Rural view of rolling countryside with grazing cattle, near Frome, Somerset, UK. July 2014.

Ross Hoddinott / The Northern Lights / Aurora Borealis over a river, Vik, Iceland. February 2014.

Benoit Stichelbaut / Rough seas during Storm 'Ruth', Ile d'Ouessant, Armorique Regional Park, Iles du Ponant, Finistere, Brittany, France, Iroise Sea. 8th February 2014. France, Bretagne, Finistere, Mer d'Iroise, Iles...

Juergen Freund / Stars facing north towards constellation Perseus with Perseid meteor shower, above farming fields in the Atherton Tablelands, Far North Queensland. August 14, 2013 4am, composite image.

Peter Cairns / Isle of Rum at sunset viewed from Eigg, Scotland, April 2013.

Guy Edwardes / Quilota Crater Lake, Cotopaxi Province, Ecuador, September 2010.