Do Levant Sparrowhawks Accipiter brevipes also migrate at night?

Ibis - Tập 135 Số 3 - Trang 233-236 - 1993
Herbert H. Stark1, Félix Liechti1
1Schweizerische Vogelwarte, CH‐6204 Sempach, Switzerland

Tóm tắt

Flight paths of visually identified Levant Sparrowhawks Accipiter brevipes on autumn migration were analysed with a tracking radar in the Arava Valley, Israel. This time of the year there are no significant numbers of other species with a similar wing‐beat pattern. This wing‐beat pattern was found not only in daytime but also frequently at night. It is suggested that the Levant Sparrowhawk uses two strategies of migration: (1) soaring and gliding to reduce energy consumption; (2) flapping flight to reduce time spent on migration. The latter may be more important towards the end of the migratory season and/or when birds have become separated from the main migratory stream.

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Ibis

Tập 135 Số 3

233-236

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