The spotted hyena of Eastern Africa can engage in sophisticated cooperation to overcome a more powerful predator, the lion. This video shows how a few hyenas first come across the lions at a kill, then make vocalizations to attract more hyenas to the area, excite each other through further vocalization, touching, and gestures, and eventual form a mob that jumps the lions and chases the lions away from the kill. (The video was shot by someone in South Africa, with permission given to Kay Holekamp to use it.)