There's nothing like a nature documentary with a decent narrator, and we've certainly got one tonight, as Billy Connolly's dulcet tones take us to the Alaskan wilderness. We're on the trail of a pack of grizzly bears who have just come out of hibernation, and are set for a long spring/summer season of feeding, fighting and mating. In Part 1 we're meeting first-time mum Parsnip who's trying to raise her young cub Pushki in some rather difficult circumstances. They're on Van and Alice's territory, and as far as the bigger bears are concerned, Pushki is a nice meal...