Did some drawings after looking at some birds flying around outside - making notes on some of the observations I made. One observation I did make was how stunningly little movement is actually noticable for the majority of flight. On take off, landing, and sudden sharp changes in direction and speed, there can be lots of wing movement, lots of up and down, but most of the time the birds in the air, there's very little movement at all.
It's at low speed that there's significant wing movements - hence why birds intending to launch or land have significant amounts of high