Common swifts make mysterious twilight ascents

Common swifts climb to altitudes of up to 2.5 km both at dawn and dusk. This unexpected behaviour was discovered by geo-ecologist Dr Adriaan Dokter of the University of Amsterdam's (UvA) Institute for Biodiversity and Ecosystem Dynamics (IBED) together with colleagues from the Royal Netherlands Meteorological Institute (KNMI), the Royal Netherlands Air Force and Lund University. The research results were published as a featured article in the March issue of the scientific journal Animal Behaviour.

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