Secret Life of The Forest - Season 1 Episode 4 -

Winter in Kielder Forest, a time when the harsh beauty of frost and snow grips the landscape as wildlife battles to survive. While some creatures sleep through the season, certain animals continue to search for food, with red squirrels sniffing out their stored nuts, smaller birds joining forces to forage on the ground, and Britain's only aquatic songbird, the dipper, leaping into the freezing river to hunt its prey.