Barn-Swallow flying cycle

This bird is part of a video that I produced as a Volunteer to promote the World Migratory Bird Day.

To better understand the movement, I originally animated the bird at this speed.
During the animation I had to accelerate it, to look more natural, since the Barn-Swallow beats its wings between 18 and 7 times per second!

check the full project here:
https://www.behance.net/gallery/51954153/World-Migratory-Bird-Day-2017