Question

Why the motion of birds wings is considered oscillatory?

Answer 1

This is a poor option if you plan on going to the toilet, but it's great if you like to look at stuff. I think that's a fair trade off.

In a recent flight, I had a nice view of the wing. It's pretty cool to realize how much the wing oscillates—especially when the aircraft enters some turbulence. Check it out.

There are two questions I think of looking at this oscillation. First, how large is the amplitude of oscillation? Second, why do the wings oscillate? Here are the answers.