Letters

01 August 1952 Comments Letters SIRS,--The Ibis for April 1953 will include a group of papers on Visible Migration (particularly in passerine birds) as observed in various countries. The newly-formed Sub-committee on Visible Migration of the British Trust for Ornithology (see below) fee...
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Letters

01 February 1935 Comments Letters SIRS,--May I say something on this vexed subject ? I speak of those territorial species whose young depend upon insects for food. Three sets of facts seem connected :-- (i) T h a t in a cold and wet breeding season we find infertile eggs, chicks dead in t...
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Territory Reviewed

01 December 1933 Comments Main paper I T is now some twenty-five years since the theory of " territory " in bird life was enunciated b y Eliot Howard (1907-14, 1920, 1929) as the result of his intensive study of the behaviour of some of the Warblers and Buntings. The attractive nature of the...
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