Adult male Polar Bear (Ursus maritimus) in fresh snow near Churchill, Manitoba, Canada.

Adult male Polar Bear, Ursus maritimus, close-up near Churchill, northern Manitoba, Hudson Bay, Canada

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

Polar Bear (Ursus maritimus) walking near Churchill, Manitoba, 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.

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

Polar Bear cubs snuggled and resting on mothers body, Ursus maritimus, taiga, Churchill, Manitoba, Hudson Bay, Canada

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

Tranquilized Polar Bear, Ursus maritimus, being prepared for transfer by helicopter 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

Adult male Polar Bear, Ursus maritimus, resting on taiga outside Churchill, northern Manitoba, Hudson Bay, Canada

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