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Bird flight occurs over a range of Reynolds numbers (Re; 10 4 рReр10 5 , where Re is a measure of the relative importance of inertia and viscosity) that includes regimes where standard aerofoil performance is difficult to predict, compute or measure, with large performance jumps in response to small changes in geometry or environmental conditions. A comparison of measurements of fixed wing performance as a function of Re, combined with quantitative flow visualisation techniques, shows that,doi:10.1242/jeb.007823 pmid:18165249 fatcat:m7otfng6ozdvvhch653vpwll5y