Cameras capture the various wildlife residing in England's most vast forest, Kielder in Northumberland, including roe deer, red squirrels, pipistrelle bats, otters, ospreys and more, as woodland changes occur throughout the seasons. It's springtime, with the lengthening days bringing a surge of life to this stunning wilderness. A rich collection of wildlife that has either spent the winter hidden away or in warmer climes is ready to return for a burst of activity.