Eek, some of these are pretty violent. o_o
But, may I have one, if it's all right?
Pidgey is flying through the sky, then passes behind a cloud and when you see it again, it's a Pidgeotto. It keeps on flying and passes behind another cloud, and when you see it this time, it's a Pidgeot. It alights, and looks at another Pidgey, who takes off...
Repeat and repeat and repeat.
Try to make it look as if they're flapping, okay? ^^