Biologists struggle to single out a leading cause of the caribou population’s decline. Increased wolf predation, changed migration patterns and climate warming affecting food sources can all influence the herd. “It’s going to be another rough winter again this year without caribou,” Selawik resident Norma Ballot said.

One of the largest caribou herds in Alaska is shrinking, prompting hunters and conservationists to consider recommending hunting restrictions.

The number of animals in the Western Arctic Caribou Herd (WACH) is down by 20 percent. The calving parturition average was also significantly lower than recent years, with 2020 at 67%.

For millennia, ecosystems in Greenland and throughout the Arctic have been regulated by seasonal changes that govern the greening of vegetation and the migration and reproduction of animals. But a rapidly warming climate and disappearing sea ice are upending that finely tuned balance.

The size of a large caribou herd in Alaska's Arctic region has dropped by more 50 percent over the last three years, and researchers who have tentatively ruled out hunting and predation as significant factors for the decline are trying to determine why.