Overview: Winterwatch returns live from the Scottish Highlands with the very best seasonal wildlife stories. Chris Packham, Michaela Strachan and Martin Hughes-Games are back in the Cairngorm Mountains, following golden eagles, otters and pine martens. With the area suffering winds of up to 100mph, Martin braves the elements to examine how the local wildlife shelter from the storms. And Iolo Williams reports on a grey seal baby boom on the wild Norfolk coast.