Animating a Flap Cycle

My last assignment with Animation Apprentice is to animate a flying bird. The flap cycle is surprisingly straight forward, the only complication comes when studying the actual motion of a bird's wing and making sure it's doing what a bird, does!

The rig isn't the best to use for close ups. It's quite geometric and low-poly, but the overall effect is very pleasing if the camera angle isn't too close.

Since the bird looks like a crow, I figured it was appropriate to go gothic with my shot. My murder of crows swoop in, and swoop out towards the moon. What do you think?