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Flap-number histogram contour plots for flap-averaged dorsal acceleration (a), and net pitch (b) and yaw (c) angular displacements (averaged over 5 flaps). Turning with optimal banking requires an increase in dorsal acceleration, and pitch and yaw displacement every flap (insets). Black lines show the predicted (from GPS alone) against observed (IMU alone) relationships for birds, assuming they bank optimally during turns.
