Filmmaker Bertie Gregory records the first-ever video of the two predators facing each other in the Canadian Arctic.
What appears to be a fierce standoff is part of a tender ritual between two male polar bears.
Although not as imposing as polar bears, smaller creatures like the arctic fox and snowy owl have the skills to survive their brutal environment.
Polar bears are under the care of their mom for two and a half years until they must survive the Arctic on their own.
From the minute the pups are born, they enter a race against time.