Fig. 3. The proportion of each wind tunnel flight during which two starlings flew with consistent flapping flight in a steady position in the flight chamber, rather than alternating flapping and gliding flight (bird 15, , bird 19, ). The lines show the back-transformed relationships between arcsine(proportion of time spent in steady flight) (p) and flight speed (V) for each bird: bird 15, arcsinep=(1.86±0.34)–(0.148±0.034)V, r²=0.46, P<0.001; bird 19, arcsinep=(4.67±1.54)–(0.690±0.278)V+(0.032±0.012)V², r²=0.39, P=0.015 (means ± S.E.M., N=24 for bird 15 and 21 for bird 19).