Edwatd Grey Institute, Oxford Recent radar studies in north-east England (Evans 1966) have shown that, even at night, migrating passerines can compensate for wind drift. Thus they usually fly on chosen tracks rather than chosen headings. This finding contrasts with the interpretation of earlier radar results (e.g. Lack 1959-63, Bergman and Donner 1964), but it has been shown independently by Evans...

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