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 December 1975
Comments Letters The origin of British Aquatic Warblers In his letter (Brit. Birds, 67: 443-444), Dr J. T. R. Sharrock made the hypothesis that the autumn records of Acrocephalus paludicola in Britain and Ireland are probably to be explained by a reverse migrat...
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