"There was also a single cub track leading up to the wolf encounter, and after that, only the single track of a female polar bear going out to the ice of western Hudson Bay," he said.
The polar bear cub was probably four or five months old, Hedman said.
"I've had reports from people who have actually seen this sort of thing before," he said.
"What will happen is the female polar bear can't react quickly enough when the wolves are in a pack. Some of the wolves are getting her attention and the others go for the cub."
Other scientists and researchers have also seen evidence of wolves hunting polar bear cubs.
