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 theory itself, supported b y a wealth of laborious observation, gained for it a ready acceptance. In our criticism we submit t h a t so far suffic...

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