Two Types of Orientation in Migrating Starlings, Sturnus yulgaris L., and Chaffinches, Fringilla coelebs L., as Revealed by Displacement Experiments
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CONTENTS Introduction . . . . . . . 1 Experiments with Starlings. 5 Methods. . . . . .. 5 Normal course of autumn migration 6 Numbers transported and recovered 11 Recoveries in the same season from transports in which adults and juveniles were released separately. . . . . . . . . . . . .. 15 Recoveries in the same season from transports in which adults and juveniles were released together 22 Recoveries in later seasons 24 Experiments with Chaffinches 28 Discussion . . 30 Summary 33 Samenvatting . 34 Literature . . 36
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[2] Joost ter Pelkwyk. Fowling in Holland , 1941 .
[3] W. Rowan. Experiments in Bird Migration , 1932 .
[4] Brina Kessel. Criteria for Sexing and Aging European Starlings (Sturnus vulgaris) , 1951 .