Letters

01 December 2001 Comments Letters When watching House Martins Delichon urbica in 1967, I wrote in my notebook: `Is the mud for the structure of their nests carried on, rather than in, their beaks?'. My impression then was that the birds carried up the mud on the beak, and pressed it in...
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Letters

01 October 1993 Comments Letters Identification of Tennessee Warbler. One glance at the coloured photograph of a Tennessee Warbler Vermivora peregrina [Brit. Birds 85: plate 267) solved a problem of ten years' standing for me, though the issue was not discussed by Dr Colin Bradsh...
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