This is 20 separate photos (fast-action mode, each row left to right), though the same motions are repeated several times. The nestling seems to be practicing his flight skills, which in this case meant hovering above his siblings for a while and then lowering himself into the nest between them.
It's interesting to note how the legs are lower on the downstroke than on the upstroke (particularly noticeable on the second row, where I did a better job keeping the nest at the same height in my crops).
Some of the individual photos are in my stream, but not all of them, because of the similarity in poses for several. Photos taken August 6. I believe this chick fledged two days later, and I was able to observe it.
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