Our mountains and uplands are the most dramatic wilderness in Britain. Inaccessible, beautiful and brutal... only the hardiest of animals survive here. We open in the snowy Cairngorms, home to the Golden Eagle - our most impressive bird of prey. It can reach speeds of 180 mph - but catching a Mountain Hare isn't easy. An on-board camera offers a bird's eye view of the hunt. But these hares have survived in our uplands since the Ice Age... On the lower slopes, it's breeding season for Scotland's 400,000 red deer. We gain intimate insight into this ancient ritual, and witness a brutal battle between heavyweight stags vying for dominance and mating rights. When winter takes grip in the mountains, Ptarmigan and Reindeer vie for the crown of Britain's toughest animal, both supremely adapted to life above the treeline. Further south lie the Yorkshire Dales, home to the flamboyant black grouse. At traditional 'lekking sites' the males (or cocks) compete for dominance. Posturing, bubbling ...