Letters

01 October 1985 Comments Letters Distinction between Mandarin and Wood Duck in female-type plumages. A comprehensive description of differences between Mandarin Aix galericulata and Wood Duck A. sponsa was given by C. Holt {Brit. Birds 11: 227-232). As he noted, however, some of the c...
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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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Reviews

01 February 1971 Comments Reviews Signals for Survival. By Niko Tinbergen and Hugh Falkus. Drawings by Eric Ennion. Clarendon Press, Oxford, 1970. 80 pages; 88 photographs; many coloured sketches. £2. Based on the B.B.C. film which won the Italia Prize for documentaries in 1969, thi...
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