Overview:Zoologist Nigel Marven explores the wildlife of the Canadian Arctic. Nigel witnesses a flurry of polar bear activity in Igloolik as the predators wait patiently for some walrus to show up. In the south, more bears patrol Churchill town, waiting for Hudson Bay to freeze over so they can hunt at sea. Nigel uses a 'tundra buggy' to get around, as large males play-fight in the middle of a snowstorm.