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Fig.7. Body tilt averaged across the upstroke, downstroke and mid-stroke portions of the wingbeat cycle. For both bird 1 (A) and bird 2 (B), body-tilt angle showed a significant quadratic relationship with air speed, and decreased with increasing air speed (GLM; bird 1: F1,8=5.92, P<0.05; bird 2: F1,7=41.78, P<0.0001). Values are means ± S.E.M. (N=5).