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Figure 7


Fig. 7. Alula mechanics during gliding perching manoeuvre. Time interval between frames: 80 ms. (A) Alula is flush with the wing during the early stages of the gliding approach. (B) Alula peels from the tip towards the end of the gliding approach. (C) Hand-wing begins to sweep back, causing peeling alula to protrude further from wing surface. (D) Alula actively protracts. An animation of the complete sequence at 500 frames s–1 showing the entire bird is provided in supplementary material Movie 7.





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