Ant mill

An ant mill is a bad thing that happens when a group of ants get stuck in an endless loop. Ants have a tendency to follow a path that another ant has already taken, so a group of ants can end up following the same exact path in circles, never getting anywhere. This is what an ant mill looks like. It happens when the trail of ants get stuck in a circle, making the ants walk in circles, never finding food or getting anywhere.