Fig. 5. Wing bending during the first upstroke. The images show a comparison of wing shape during the first upstroke after take-off (A) and the second upstroke (B) of an example escape take-off. Two camera views are shown for each stroke (top and side views). The images show the fly's wing position 7 frames (1.2 ms) after the start of the respective upstrokes. The red arrows point to a flexure point along the left wing. The wing bends nearly 90° at this point during the first upstroke, but only minimal bend is evident during the second, more `normal' upstroke (see also supplementary material Movie 3). The right wing also appears to bend in a similar fashion.