The Company of Biologists

Table 2.

Timing of lesser underwing covert feather deflection in gliding perching sequences

Event	Time of occurrence (ms)
Run	4	6	8	9	13
Alula begins to peel	–154	–222	–102	?	?
Hand-wing begins to sweep	–138	–90	–64	–122	?
Alula begins to protract	4	28	2	8	–34
Lesser underwing covert deployment
Begins	–6	4	–4	38	20
Complete	56	64	48	92	100
Lesser underwing covert closure
Begins	178	88	366	222	102
Complete	318	150	492	316	200

Event	Time of occurrence (ms)
Run	4	6	8	9	13
Alula begins to peel	–154	–222	–102	?	?
Hand-wing begins to sweep	–138	–90	–64	–122	?
Alula begins to protract	4	28	2	8	–34
Lesser underwing covert deployment
Begins	–6	4	–4	38	20
Complete	56	64	48	92	100
Lesser underwing covert closure
Begins	178	88	366	222	102
Complete	318	150	492	316	200

Times are referenced to the point of maximum wing flexion(t₀) and are accurate to ±4 ms