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Autumnwatch returns for a celebration of UK wildlife. Chris Packham and Kate Humble are on a mission to track down one of the UK's biggest autumn wildlife spectacles - vast flocks of roosting starlings. Using cutting-edge technology, the team uncover the secret of their stunning aerial displays, and try to get inside the roost . Across the country, wildlife is massing in vast numbers, and there is a guide to the top spectacles of the season. Meanwhile in Wales, guest presenter Iolo Williams reveals the surprising and mysterious life of the region's most iconic fish, the sea trout.