A deer stag walks through autumn foliage, Richmond Park, London, Britain, Nov. 17, 2021.

A silhouette of deer is seen during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A deer stag barks during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A silhouette of a deer stag is seen during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A silhouette of a deer is seen during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A deer stag barks during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A deer is silhouetted as the sun rises through mist during the annual rutting season in Richmond Park, London, Britain, Oct. 18, 2021.

Young deer graze near autumn foliage, Richmond Park, London, Britain, Nov. 17, 2021.

Deer stags clash antlers during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A silhouette of deer is seen during the rutting season in Richmond Park, London, Britain, Nov. 16, 2021.

A stag deer is silhouetted before sunrise during the annual rutting season in Richmond Park, London, Britain, Oct. 18, 2021.