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Wingbeat frequency of barn swallows and house martins: a comparison between free flight and wind tunnel experiments

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Figure

Table 1. Body mass and wing span of the juvenile birds testedin the windtunnel and values taken from the literature foradult free-living birds
Fig. 1. Characteristic unfiltered echo signatures of barn swallows (BS) and housemartins (HM) during climbing (BS1, HM1), horizontal (BS2, HM2) and descending(BS3, HM3) flight recorded by tracking radar
Fig. 3. Effective wingbeat frequency averaged over 20s with respect to true air speed (A)and flight angle (B)
Fig. 6. Comparison of the effective wingbeat frequency for radar-trackedhirundines with wind tunnel observations

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