Autumnwatch returns for an eight week celebration of UK wildlife. New presenter Michaela Strachan joins Chris Packham and Martin Hughes-Games, broadcasting live from the National Arboretum at Westonbirt. They'll be sharing their adventures from the previous few days. This week, their journey takes them to the spectacular Wye Valley, on the trail of wild boar, swarming bats, and autumn's wild harvest. Meanwhile, guest presenter and naturalist Roy Dennis is following the perilous migration of the Springwatch osprey chicks as they leave our shores and head for Africa.