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) by C. T. Holmstrom et al. and in Atlas o fEuropean Birds (1960) by K. H. Voous, show Treecreepers Certhia familiaris of the northern race familiaris
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