That's right, lets get a different take on the bouncing ball.
Let's animate a bouncing ball to mimic the pattern of a bird in flight.
I was thinking of a heavy bird such as this Harpy Eagle.
[video]http://cache1.asset-cache.net/xd/85084224.mov?v=1&c=NewsMaker&k=2&d=B655008BE7C220707AEA724571DC9D69E30A760B0D811297[/video]
Notice how much the rear of the body and especially the feet go up and down.
Just in case that video won't embed, its from Getty Images:
http://www.gettyimages.com/detail/85084224/Image-Bank-Film
Try and animate a 'bouncing' ball with the same up and down momentum as the rear of the bird.
For extra credit, try adding on some legs and feet for secondary.
-DJ