T H E dispersal of young' birds away from their birth-places has been studied for a number of species by different authors. Kluijver (1951), Koskimies (1948), Kratzig (1939) and Plattner & Sutter (1946, 1947) have all made studies of dispersal in the Great Tit (Parus major), while Butts (1931) and Odum (1941) have made similar studies for the Black-capped Chickadee (Parus atricapiUus). Butts (loc. ...

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