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• W2071344894 abstract "Common swifts are specialist flyers spending most of their life aloft, including night-time periods when this species roosts on the wing. Nocturnal roosting is preceded by a vertical ascent in twilight conditions towards altitudes of up to 2.5 km, behaviour previously explained as flight altitude selection for sleeping. We examined the nocturnal flight behaviour of swifts, as uniquely identified by a Doppler weather radar in central Netherlands using continuous measurements during two consecutive breeding seasons. Common swifts performed twilight ascents not only at dusk but also at dawn, which casts new light on the purpose of these ascents. Dusk and dawn ascents were mirror images of each other when time-referenced to the moment of sunset and sunrise, suggesting that the acquisition of twilight-specific light-based cues plays an important role in the progression of the ascents. Ascent height was well explained by the altitude of the 280 K isotherm, and was not significantly related to wind, cloud base height, humidity or the presence of nocturnal insects. We hypothesize that swifts profile the state of the atmospheric boundary layer during twilight ascents and/or attempt to maximize their perceptual range for visual access to distant horizontal landmarks, including surrounding weather. We compare twilight profiling by swifts with vertical twilight movements observed in other taxa, proposed to be related to orientation and navigation." @default.
• W2071344894 created "2016-06-24" @default.
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• W2071344894 date "2013-03-01" @default.
• W2071344894 modified "2023-09-26" @default.
• W2071344894 title "Twilight ascents by common swifts, Apus apus, at dawn and dusk: acquisition of orientation cues?" @default.
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• W2071344894 doi "https://doi.org/10.1016/j.anbehav.2012.12.006" @default.
• W2071344894 hasPublicationYear "2013" @default.
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