Dr. Adriaan Dokter of the University of Amsterdam observed the regular crepuscular ascent of common swifts to a height of 2.5 kilometers. | Harper's Magazine

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Dr. Adriaan Dokter of the University of Amsterdam observed the regular crepuscular ascent of common swifts to a height of 2.5 kilometers.

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Dr. Adriaan Dokter of the University of Amsterdam observed the regular crepuscular ascent of common swifts to a height of 2.5 kilometers. 

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