Ross Hoddinott / 2020VISION / Sika deer (Cervus nippon) stag on salt marsh at Arne RSPB reserve, with Poole harbour visible in the background, Dorset, England, UK, August

Luiz Claudio Marigo / Young female Marsh Deer (Blastocerus dichotomus) in profile. Endangered species. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Christophe Courteau / Marsh Deer stag (Blastocerus dichotomus) Pantanal, Brazil

Christophe Courteau / Marsh Deer stag (Blastocerus dichotomus) Pantanal, Brazil

Roland Seitre / Marsh deer (Blastocerus dichotomus) on wetland, Estancia Tacuaral, Santa Ana del Yacuma, Beni, Bolivia, 2008

Gerrit Vyn / Buck White tailed Deer (Odocoileus virginianus) in coastal marsh, Sabine National Wildlife Refuge, Louisiana, USA. December

Andrew Parkinson / Sika deer (Cervus nippon) large number grazing on coastal marshes, introduced species, Arne RSPB Reserve, Dorset, UK, October.

Luiz Claudio Marigo / Adult male Marsh Deer (Blastocerus dichotomus) male in grasslands. Endangered species. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Luciano Candisani / Marsh Deer (Blastocerus dichotomus) male, Pantanal, Brazil

Luciano Candisani / Marsh Deer (Blastocerus dichotomus) female, Pantanal, Brazil

David Kjaer / Sika deer (Cervus nippon) stags in summer coat on salt marsh in Poole Harbour, Dorset, England, August 2009

Michael Hutchinson / Marsh deer {Blastocerus dichotomus} feeding on marsh, Esteros del Ibera, Argentina, vulnerable species