Dozens of moose carcasses were discovered last spring in a Lapland national park, and Finland animal disease watchdog Evira has since determined that the animals died of malnutrition. The reason why they were unable to find sustenance is a mystery, as the area had relatively normal temperatures and snowfall last winter.

Moose and other species have advanced north with warming temperatures. University of Alaska Fairbanks assistant professor of water and environmental research Ken Tape said movement of boreal species into far northern Alaska has corresponded over the last century with earlier snow-melt and river ice out.