Unalaska is famous for its deep-water port that doesn't freeze in the winter, but the island hasn’t always been this warm.

Additionally, the bear roamed 51% public land north of the highway, much of that related to his den site. The percentage of public land rose to 65% south of the highway, Costello noted.

Each year, polar bears in Canada's Hudson Bay face a race against the seasons. As summer rolls in and sea ice melts, their ...