Polar Bear Mother protecting cubs, Ursus maritimus, taiga, Churchill, Manitoba, Hudson Bay, Canada

Polar Bear tracks, Ursus maritimus, in fresh snow near Churchill, northern Manitoba, Hudson Bay, Canada

Female Polar Bear, Ursus maritimus, on fresh snow near Churchill, northern Manitoba, Hudson Bay, Canada

Mother Polar Bear, Ursus maritimus, on fresh snow near Churchill, northern Manitoba, Hudson Bay, Canada

Mother Polar Bear, Ursus maritimus, with 2 COY (Cubs of the Year) in blizzard conditions near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bear, Ursus maritimus, (head detail) near Churchill, northern Manitoba, Hudson Bay, Canada

Mother Polar Bear (Ursus maritimus) with 3 month old cubs near Wapusk Park, northern Manitoba, Canada.

Mother Polar Bear (Ursus maritimus) with 3 month old cubs near Wapusk Park, northern Manitoba, Canada.

Adult Polar Bear (Ursus maritimus) following in tracks on open tundra outside Churchill, Manitoba, Canada.

Adult male Polar Bear, Ursus maritimus, in fresh snow and spruce trees near Churchill, northern Manitoba, Hudson Bay, Canada

Male Polar Bears, Ursus maritimus, engaged in ritualistic mock fighting (serious injuries are rare), near Churchill, northern Manitoba, Hudson Bay, Canada

Young Polar Bear, Ursus maritimus, inspects Tundra Buggy near Churchill, northern Manitoba, Hudson Bay, Canada

Polar Bear cubs (Ursus maritimus) running on open snow, Churchill, Manitoba, Hudson Bay, Canada