Letters

01 July 1985 Comments Letters Origin of British Glaucous Gulls. I read with interest A. R. Dean's comments on the possible origins of Glaucous Gulls Larus hyperboreus in Britain and related incidences of occurrences of hybrid Glaucous X Herring Gulls L. argentatus {Brit. Birds 77: ...
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Letters

01 June 1985 Comments Letters Bill coloration of treecreepers. The note by Laurel Tucker (Brit. Birds 77: 263-264) questions if the upper mandible coloration could assist in the field separation of the two European treecreepers Certhia. Photographs, in Vara Figlar i Norden (1942) b...
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