Ants running in a circle lost the pheromone trail and keep running in circles until they die.

en.wikipedia.org/wiki/Ant_mill

“An ant mill was first described in 1921 by William Beebe, who observed a mill 370 meters (1,210 ft) in circumference. It took each ant two and a half hours to make one revolution.”

I’m curious where he found it. Sounds like quite a sight

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…