I'm curious how often this leads to mass death. I suspect that there is some escape from this, or else conditions leading to an ant mill are extremely rare, bec

I'm curious how often this leads to mass death. I suspect that there is some escape from this, or else conditions leading to an ant mill are extremely rare, because it seems evolutionarily expensive. On the other hand nature is profligate with life, and especially bugs. For example perhaps once exhausted to a certain point, the pheromone scent changes to one that signals not to follow.