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 February 1964 Comments Letters 'Industrial' discoloration of House Sparrows Sirs,--I was rather interested in Ian Woodward's suggestion (Brit. Birds, 56: 470-471), following my note on 'industrial' discoloration of House Sparrows Passer domestkus {Brit. Birds, 56: 296-297), that white ...
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