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Titre :
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Orientation Behavior of Night-Migrating Birds (European Robins) during Late Afternoon and Early Morning Hours
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Auteurs :
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Wolfgang Wiltschko ;
Hiltrud Höck
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Publisher :
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The Wilson Bulletin, 84(2)
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Type de document :
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Article
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Année de publication :
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1972
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Format :
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149-163
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Langues:
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Anglais
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Résumé :
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[1. The birds' activity during early morning hours is concentrated in migratory direction, but only when the birds showed migratory activity in the night before. 2. When the magnetic field was artificially changed (magnetic north at 115° in ESE), the birds during morning hours selected their migratory direction according to the direction of the magnetic field. 3. The birds' behavior during late afternoon and evening shows a "nonsense orientation" towards the geographic NNW sector in Test (magnetic north in ESE) and Control (earth's magnetic field) in spring as well as in autumn. 4. This "nonsense orientation" seems to persist under clear, partly covered and overcast skies, and might be explained as a temporarily fixed part in the birds' behavior pattern caused by carrying the birds into the cage from the opposite side.]
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En ligne :
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https://www.jstor.org/stable/4160191
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