Two Red Deer stags 'rut' in the early morning mist in Richmond Park on October 15, 2011 in London, England. A Red Deer stag stands in the early morning mist in Richmond Park. Two Red Deer stags stand in the early morning mist in Richmond Park. Two Red Deer stags stands 'rut' in the early morning mist in Richmond Park. Autumn sees the start of the 'Rutting' season where the large Red Deer stags can be heard roaring and barking in an attempt to attract females known as bucks. The larger males can also be seen clashing antlers with rival males.