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Report number 197 from Kvismare Bird Observatory:

Extreme altitudes during diurnal flights in a nocturnal songbird migrant

Sjöberg S, Malmiga G, Nord A, Andersson A, Bäckman J, Tarka M, Willemoes M, Thorup K, Hansson B, Alerstam T & Hasselquist D
Article in journal
Science. 2021. Volume 372, page(s) 646-648. https://doi.org/10.1126/science.abe7291