The Irish Elk was the largest deer that ever lived. Its home was Eurasia, from Ireland into the lakes at Baikal during the Pleistocen area. The last of the giant deer died out about 7 thousand years ago.
"The Irish Deer or Giant Deer was a species of Megaloceros and one of the largest deer that ever lived. Its range extended across Eurasia, from Ireland to east of Lake Baikal, during the Late Pleistocene.