Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus), walking through water of Yangtze river, Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China

Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus) stag wading through the water of the Yangtze river, Hubei Tian'ezhou Milu National Nature Reserve, Hubei, China

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag in upland landscape. Lochcarron, Highlands, Scotland, UK.

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag in upland landscape. Lochcarron, Highlands, Scotland, UK.

Paul Williams / Moose (Alces alces) female with twin calves, Baxter State Park, Maine, USA, June.

Ingo Arndt / Reindeer (Rangifer tarandus) bull, Jason Harbour, South Georgia, February

George Sanker / Moose (Alces alces) bull swimming in water, Baxter State Park, Maine, USA.

Staffan Widstrand / Roe deer (Capreolus capreolus) drinking, Pusztaszer protected landscape, Kiskunsagi, Hungary, May.

Ole Jorgen Liodden / Svalbard reindeer (Rangifer tarandus platyrhyncus) feeding at sunset, Spitsbergen, Svalbard, Norway, April.

Igor Shpilenok,Igor Shpilenok / Large male Reindeer (Rangifer tarandus) standing in shallow waters of the Kronotsky lagoon, away from biting insects. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, July.

Sven Zacek,Sven Zacek / Two bull Moose (Alces alces) sizing each other up during the annual rut, after sunset with migrating geese in flight. Western Estonia, September.

Steven Kazlowski / Moose (Alces alces) bull adult swims across a lake in Denali National Park, Interior of Alaska, summer, USA

Ernie Janes / Fallow deer (Cervus dama) two female does bathing in lake, Norfolk, UK July

Martin Dohrn / Starlight camera image in moonlight of Eurasian wild boar (Sus scrofa) feeding on carcass of Spotted deer stag (Axis axis) watched by Asian water buffalo (Bubalas bubalas) while the leopard (Panthera...

Fabrice Cahez / Roe Deer (Capreolus capreolus) swimming across River Allier, France, February.

Bernard Castelein / Hog Deer (Cervus / Axis / Hyelaphus porcinus) crossing a stream. Kaziranga National Park, Assam, India, February.

Danny Green / 2020VISION / Red deer (Cervus elaphus) stag crossing a river, Bradgate Park, Leicestershire, England, UK, October

Orsolya Haarberg / Red deer (Cervus elaphus) herd wading through water in a flooded forest, Danube-Drava National Park, Hungary.

Rolf Nussbaumer / White tailed deer {Odocoileus virginianus} young male grazing beside water at sunset, Texas, USA

Aflo / ic-07004 Fallow deer mother + fawn at woodland stream {Dama dama}

Matthew Maran / Shadow of trained Indian elephant (Elephas maximus) carrying wildlife watchers, in green pool of water, with Barasingha / Swamp deer (Cervus duvaucel) Kaziranga National Park, Assam, India, November 2...

Matthew Maran / Portrait of Barasingha / Swamp deer (Cervus duvauceli) stag, lying at water's edge, with reflections, Kaziranga National Park, Assam, India

Patricio Robles Gil / Two male Moose (Alces alces) in lake, one drinking, silhouetted, Gran Teton National Park, Wyoming, USA, October

George Sanker / Moose (Alces alces) bull shaking off water at sunset, Great North Woods, Baxter State Park, Maine, New England, USA, Autumn

Bernard Castelein / Chital / Spotted Deer (Axis / Cervus axis) male leaping through water, Keoladeo Ghana NP, Bharatpur, Rajasthan, India

Rolf Nussbaumer / Elk {Cervus elaphus} bulls fighting, Yellowstone NP, Wyoming, USA

Mark Raycroft / Elk (Cervus elaphus) bull crossing a river

Thomas Mangelsen / Elk (Cervus elaphus) in misty waters, Yellowstone National Park, Wyoming

Tom Vezo / Male Whitetail deer {Odocoileus virginianus} Long Is, New York, USA

David Welling / Female Whitetail deer drinking {Odocoileus virginianus} Texas, USA

Louis Gagnon / Bull moose (Alces alces) feeding in lake. Gaspe Park Canada

Hermann Brehm / Sambar with White breasted kingfisher on its back, India.

Rod Williams / Male Chinese water deer {Hydropotes inermis} native to China

Jose Schell / Bull moose feeding in lake (Alces alces) Gaspe Park, Canada, North America - older moose feed on plants in deeper water

Jose Schell / Bull moose (Alces alces) feeding in lake. Gaspe Park, Canada

Oscar Dewhurst / Moose (Alces alces) bull swimming across river. Grand Teton National Park, Wyoming, USA. September.

Oscar Dewhurst / Moose (Alces alces) bull wading in river. Grand Teton National Park, Wyoming, USA. September.

George Sanker / White-tailed deer (Odocoileus virginianus) doe and fawn at edge of beaver pond. Acadia National Park, Maine, USA. June.

George Sanker / Mule deer (Odocoileus hemionus) buck drinking at edge of Yellowstone Lake, reflected in water. Yellowstone National Park, Wyoming, USA. June.

George Sanker / Mule deer (Odocoileus hemionus) buck at edge of Yellowstone Lake. Yellowstone National Park, Wyoming, USA. June.

Gabriel Rojo / Marsh deer (Blastocerus dichotomus) feeding in wetland. Pantanal, Mato Grosso, Brazil.

Yashpal Rathore / Spotted Deer(Axis axis) at lake shore, Ranthambore National park, India

Yashpal Rathore / Sambar (Cervus unicolor) stag feeding on water weeds, Ranthambore National Park, India

Yashpal Rathore / Sambar (Cervus unicolor) cautiously watching possible threat while crossing Ramganga river, Jim Corbett National Park, India.

Yashpal Rathore / Chital deer (Axis axis) herd, Tadoba National Park, India

Yashpal Rathore / Sambar (Cervus unicolor) mother with calf, Corbett National Park, India

Yashpal Rathore / Chital deer (Axis axis) mother and young, Tadoba National Park, India

Oscar Dewhurst / Red deer (Cervus elaphus) stag drinking from a lake. Bushy Park, London, UK. September. Cropped

Jack Dykinga / Deer Creek with autumn Cottonwood (Populus) trees following the river, in sandstone wilderness at dusk. Grand Staircas-Escalante National Monument, Utah, USA, October 2018.

Jack Dykinga / Deer Creek with autumn Cottonwood (Populus) trees following the river, in sandstone wilderness at dusk. Grand Staircas-Escalante National Monument, Utah, USA, October 2018.

Jack Dykinga / Deer Creek with autumn Cottonwood (Populus) trees following the river, in sandstone wilderness at dusk. Grand Staircas-Escalante National Monument, Utah, USA, October 2018.

Daniel Heuclin / Babiroussa (Babyrousa babyrussa) standing in water, Sulawesi, captive.

Yashpal Rathore / Sambar deer (Rusa unicolor) stag drinking at waterhole Kanha National Park, Central India. Camera trap image.

Yashpal Rathore / Indian muntjac (Muntiacus muntjak) drinking water from puddle. Kanha National Park, Central India. Camera trap image.

Yashpal Rathore / Spotted deer / Chital (Axis axis) stag, drinking water from puddle. Kanha National Park, Central India. Camera trap image.

Yashpal Rathore / Spotted Deer / Chital deer (Axis axis) with Sambar deer (Rusa unicolor) drinking water at waterhole Kanha National Park, Central India. Camera trap image.

SCOTLAND: The Big Picture / Red Deer (Cervus elaphus) covering itself in mud from a muddy puddle after urinating in it in order to smell strong and warn off rivals, Scotland, UK, October.

Terry Whittaker / Fallow deer (Dama dama) drinking at water channel through dunes, Netherlands.

Robin Chittenden / Chinese Water Deer (Hydropotes inermis) Norfolk UK September

Robin Chittenden / Chinese water deer (Hydropotes inermis) Norfolk, England, UK, September.

Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus), stag running through the water of the Yangtze river, Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China.

Staffan Widstrand / Wild Wonders of China / Male Pere David's deer / Milu (Elaphurus davidianus), walking beside the shore, Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China

Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus) stags in the Yangtze river, Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China

Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus) stags at Yangtze river, Hubei Tian'ezhou Milu National Nature Reserve, Hubei, China

Sven Zacek / Red deer (Cervus elaphus) stag walking in Baltic Sea, Saaremaa Island, Western Estonia. July.

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag with Loch Carron and hills in background. Highlands, Scotland, UK. December

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag with Loch Carron and hills in background. Highlands, Scotland, UK. December

Paul Williams / Moose (Alces alces) young male with antlers in velvet approaching female, Baxter State Park, Maine, USA

Paul Williams / Moose (Alces alces) female with twin calves on riverbank, Baxter state park, Maine, USA, June.

Paul Williams / Moose (Alces alces) female with twin calves on riverbank, Baxter state park, Maine, USA, June.

Paul Williams / Moose (Alces alces) female with twin calves on riverbank, Baxter state park, Maine, USA, June.

Paul Williams / Moose (Alces alces) female with twin calves on riverbank, Baxter state park, Maine, USA, June.

Paul Williams / Moose (Alces alces) female with twin calves on riverbank, Baxter State Park, Maine, USA, June.

Paul Williams / Moose (Alces alces) male, Baxter state park, Maine, USA, June.

Bruno D'Amicis / Red deer (Cervus elaphus) hind with fawn drinking at water pool in old-growth Beech (Fagus sylvatica) forest. Abruzzo, Lazio and Molise National Park / Parco Nazionale d'Abruzzo, Lazio e Molise UN...

David Fleetham / Calf cowry (Lyncina vitellus) with several Skeleton shrimp (Caprellidae sp) covering sand in front. Dumaguete, Philippines.

Franco Banfi / Marsh deer (Blastocerus dichotomus) and Capybara (Hydrochaeris hydrochaeris) resting in stream, Pantanal, Mato Grosso, Brazil

Luke Massey / Marsh deer (Blastocerus dichotomus) in water Pantanal, Brazil.

Luke Massey / Marsh deer (Blastocerus dichotomus) drinking water Pantanal, Brazil.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck swimming across water, Amur, Far East Russia. September.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck swimming across water, Amur, Far East Russia. September.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck swimming across water, Amur, Far East Russia. September.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck crossing water, Amur, Far East Russia. September.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck crossing water, Amur, Far East Russia. September.

Valeriy Maleev / Siberian roe deer (Capreolus pygargus) buck crossing water, Amur, Far East Russia. September.

Robin Chittenden / Chinese water deer (Hydropotes inermis), Norfolk, England, UK. June.

Sylvain Cordier / European roe deer (Capreolus capreolus) , a female crossing water, Rhine Forest, Alsace, France.

Olga Kamenskaya / Aerial view of Reindeer (Rangifer tarandus) fording water whilst being herded by Nenet herders. Nenets Autonomous Okrug, Arctic, Russia, July 2017

Olga Kamenskaya / Aerial view of Reindeer (Rangifer tarandus) fording water whilst being herded by Nenet herders. Nenets Autonomous Okrug, Arctic, Russia, July 2017

Olga Kamenskaya / Aerial view of Reindeer (Rangifer tarandus) fording water whilst being herded by Nenet herders. Nenets Autonomous Okrug, Arctic, Russia, July 2017

David Pattyn / Roe deer (Capreolus capreolus) on a misty morning at the edge of a pond. Valkenhorst Nature Reserve, Valkenswaard, The Netherlands. December

David Pattyn / Roe deer (Capreolus capreolus) swimming across a pond. Valkenhorst Nature reserve, Valkenswaard, The Netherlands. November.