Apparently, it was in a forest in Guyana. And well, perhaps you’re imagining a filled-out spiral, but in this case, it looked like a normal ant migration at the first. They were going in 6 lanes at most and at 370 meters circumference, that just looks like a line until you follow it around.

That’s according to this source, which seems to have excerpts from his book: themountainsarecalling.earth/the-army-ant-death-s…