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As part of our quest to improve our understanding of bird migration we have been satellite-tracking Cuckoos that breed here in the UK. This work has revealed the wintering grounds of UK Cuckoos in Africa and the routes they take to get there and back. We've been tracking twelve Cuckoos since last summer and now the first birds have made it back the the UK. Find out which Cuckoos are the first to arrive back in the UK.