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Fig. 2. Relative frequency distribution of the duration of flapping cycles for barn swallows (A) (BS) and house martins (B) (HM) in free flight. Only one 20 s interval per bird was included per flight situation. Climbing (flight angles 3.5±1.5°), NBS individuals=4, NBS flapping cycles=372, NHM individuals=6, NHM flapping cycles=779; horizontal flight (flight angles 0±1.5°), NBS individuals=13, NBS flapping cycles=1387, NHM individuals=8, NHM flapping cycles=890; descent (flight angles -3.5±1.5°), NBS individuals=18, NBS flapping cycles=1691, NHM individuals=9, NHM flapping cycles=952. True air speed was restricted to 10-16 m s-1.





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