Tranquilized Polar Bears, Ursus maritimus, being transferred by helicopter near Churchill, northern Manitoba, Hudson Bay, Canada. They hold the polar bears while there are problems near town. Then when the ice freezes they help them with their migration.

Captured Polar Bear (Ursus maritimus) being readied for helicopter transport near Churchill, Manitoba, Canada.

Captured Polar Bears (Ursus maritimus) being readied for helicopter transport near Churchill, Manitoba, Canada.

Habituated Polar Bears, Ursus maritimus, feeding in the dump at night near Churchill, northern Manitoba, Hudson Bay, Canada

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

Polar Bears (Ursus maritimus) being transferred via helicopter from the Bear Jail outside Churchill, Manitoba, Canada.

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

Adult male Polar Bears, Ursus maritimus, in ritualistic fighting (this almost never leads to serious injury) 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, close-up near Churchill, northern Manitoba, Hudson Bay, Canada

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

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

Tranquilized Polar Bears, Ursus maritimus, being transferred by helicopter near Churchill, northern Manitoba, Hudson Bay, Canada