On arrival at Grafham Water, Cambridgeshire, at about midday on 15th November 2019, I heard the distant but persistent agitated alarm-calling of some Blackbirds Turdus merula coming from tall trees at the waterside and wondered if an owl could be the cause of the fuss. Common Chaffinches Fringilla coelebs and a Song Thrush Turdus philomelos were also alarm-calling, so


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