Dave Roberts

Abstract A Black Guillemot Cepphus grylle was present at Cut End on the River Witham in Lincolnshire on 7th–10th December 2017. Its strikingly white appearance suggested it belonged to the high-Arctic breeding form ‘Mandt’s Black Guillemot’ C. g. mandtii, previously unrecorded from Britain. The record was duly accepted by BBRC and BOURC as being the first Br


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