The following tutorial by Mographcandy will show you how to animate a fly’s wings thanks to the vibrate tag and will go further into the random effector to create a swarm of flies. I know its not that much related to motion design, but the vibrate tag and cloner can be used for motion design aswell:

Cinema 4D Tutorial // Create a Swarm of Flies in Cinema 4D from Mograph Candy on Vimeo.