It was like a soccer riot — ants crawling all over apparently trying to beat the snot out of each other. I half expected to see some broken beer bottles and tiny torn Manchester United T-shirts lying around. Occasionally one would fall off the edge of the curb in a Wilhelm scream-worthy fall.

Check out the video, in which if you look carefully, you’ll see three take a spill:

I’ve seen pile-ons like this once or twice before in my life, and I assume it’s a fight between rival colonies. But I’m not an entomologist. Does anyone here know what these ants are up to?