Table 1.

Body mass and wing span of the juvenile birds tested in the windtunnel and values taken from the literature for adult free-living birds

Hirundo rustica (N=3)Delichon urbica (N=4)
Wind tunnelLiteratureWind tunnelLiterature
Body mass (g)19.0-22.0311.0-28.2116.5-18.0310.3-19.81
Mean (g)20.4316.0117.3314.51
Wing span (mm)274-2843320-3452240-2583260-2902
  • 1 Ash (1969), Morocco spring migration; 2Cramp (1985/88); 3Bruderer et al. (2001).