Letters

01 February 1971 Comments Letters Elusive species and the B.T.O. Ornithological Atlas project Some species are proving to be difficult to locate in fieldwork for the Ornithological Atlas. In order to prepare full maps for these species, we cannot rely solely on fieldwork carried out purel...
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Letter

01 April 1953 Comments Letters SIRS.--I am trying to collect information about ultra-quiet bird song (sub-song, etc.) and I should be grateful if you would allow me to appeal through the medium of British Birds for any help that other observers can give me. As records on this subject a...
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