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

Curious young male Polar Bear, Ursus maritimus, standing against Tundra Buggy near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bear, Ursus maritimus, yawning while resting near Churchill, northern Manitoba, Hudson Bay, Canada

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

Adult male Polar Bear, Ursus maritimus, resting on frozen lake near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bear, Ursus maritimus, on frozen lake at sunset near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bear, Ursus maritimus, (head detail) 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

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, scratching his back/sleeping on ice 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

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

Polar Bear (Ursus maritimus)Male standing on hind legs outside Churchill, Manitoba, Canada.