Fig.5. Upstroke pause duration for bird 1 (A) and bird 2 (B). The average length of these pauses at each air speed was calculated using only those wingbeats containing the pauses (i.e. does not include pauses of zero length). The duration of these pauses reached maximal levels between 10 and 12ms^-1. Values are means ± S.E.M. (N=5).

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