Andrew Parkinson / Red deer {Cervus elaphus} adult stag roaring during the October rut, Leicestershire, UK
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Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus), two stags testing their strength in Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China
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Paul Hobson / Red deer (Cervus elaphus) herd during rut in morning light. Derbyshire, England, UK. October.
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Jeff Vanuga / Shiras moose (Alces alces shirasi) bull in rut. Grand Teton National Park, Wyoming, USA, October.
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Donald M. Jones / Elk (Cervus elaphus) bull rubbing tree during rut, western Canada
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Cyril Ruoso / Red deer (Cervus elaphus) male calling during rut, Denmark. Non-ex
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Andy Rouse / Red deer (Cervus elaphus) stag during rut, Wales, UK. September. Captive in deer park.
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Terry Whittaker / 2020VISION / Red deer stag (Cervus elephus) bellowing in mist at sunrise during rut, Bushy Park, London, England, UK, October 2011.
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David Tipling / Red deer (Cervus elaphus) stag during rut on a misty dawn in Richmond Park National Nature Reserve, London, UK, October.
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Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram and ewe during rut, Montana
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Mark MacEwen / Elk (Cervus canadensis) stag resting outside house during the rut, Estes Park, Larimer County, Rocky Mountains, Colorado, United States, September.
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Laurent Geslin / Red deer {Cervus elaphus} stag covered in mud during the rut, captive, UK