Not many. Wolves are probably the most consistent predator. Adult male polar bears have been known to kill and eat cubs if they can get their hands on them, possibly to eliminate competition. In the few places where ranges overlap, grizzly bears could take cubs. Should a cub get unlucky and end up in the water, it might be taken by an orca or greenland shark. However, given the mother polar bears excellent protection, it’s likely that starvation is the biggest threat facing young polar bears.
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