Unusual late mass occurrence of the Common Swift (Apus apus (Linnaeus, 1758)) (Aves: Apodidae) in Sofia (Bulgaria)

Keywords: Common swift , avian phenology , autumn migration , urban avifauna , swifts in Bulgaria

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Abstract:

An observation of about 120 Common Swifts over the central part of the Sofia City on 15 October is reported.

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