- Herd size (2017) 71,000
The Fortymile herd migrates between Alaska and Yukon. It was once estimated at about 600,000, and its range stretched from Whitehorse to Anchorage. By 1974, the herd was estimated at about 4,000, and it stopped migrating to Yukon. Conservation actions, including hunting restrictions and the sterilization of wolf packs were taken and the herd grew, although recent research suggests that wolf control was not a significant factor in the herd’s increase. By 2002 it was once again migrating into Yukon. The last count in 2017 estimated the herd size at 71,000.
Tactical departures and strategic arrivals: Divergent effects of climate and weather on caribou spring migrations
Demography of an increasing caribou herd with restricted wolf control: Caribou Demography and Wolves