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Autumnwatch returns for an eight week celebration of UK wildlife. Chris Packham and Kate Humble visit the south coast to witness bird migration in action - autumn is the cue for summer visitors like swallows and martens to leave our shores as redwings, fieldfares and others arrive. Kate also reveals a real autumn screamer - the sika deer, while Chris gets up close to some spectacular spiders . In the Scottish Highlands, biologist Liz Bonnin is hoping for an encounter with the rare and elusive Scottish wildcat and closer to home Martin Hughes-Games is on the trail of the best of your stories.