Ants follow eachother in a line so they don’t get lost on their way back to the nest. When they’ve lost track of the scent for any number of different reasons back to the nest they will follow the ant in front of them for guidance eventually turning into a “death spiral” seen in the picture. The ants are lost and will never find their way home and will march to their deaths.
This death spiral/"ant mill" is actually quite short, though still deadly - in the worst case scenarios, a death spiral can be literally kilometers long, some ants might not even make a single revolution around it, which is kinda terrifying to think about.
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