The Irish elk (Megaloceros giganteus), also called the giant deer or Irish deer, is an extinct species of deer in the genus Megaloceros and is one of the largest deer that ever lived. Its range extended across Eurasia during the Pleistocene, from Ireland to Lake Baikal in Siberia.

The most recent remains of the species have been carbon dated to about 7,700 years ago in western Russia.

https://en.m.wikipedia.org/wiki/File:Megaloceros_range_map.svg