Flight speeds of swifts (Apus apus): seasonal differences smaller than expected.

@article{Henningsson2009FlightSO,
  title={Flight speeds of swifts (Apus apus): seasonal differences smaller than expected.},
  author={Per Henningsson and H{\aa}kan Karlsson and Johan B{\"a}ckman and Thomas Alerstam and Anders Hedenstr{\"o}m},
  journal={Proceedings. Biological sciences},
  year={2009},
  volume={276 1666},
  pages={2395-401}
}
We have studied the nocturnal flight behaviour of the common swift (Apus apus L.), by the use of a tracking radar. Birds were tracked from Lund University in southern Sweden during spring migration, summer roosting flights and autumn migration. Flight speeds were compared with predictions from flight mechanical and optimal migration theories. During spring, flight speeds were predicted to be higher than during both summer and autumn due to time restriction. In such cases, birds fly at a flight… CONTINUE READING

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