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One ant mill There is an observed phenomenon in which a group of army ants, separated from the main foraging group, loses the pheromone track and begins to follow each other, forming a continuously rotating circle. This circle is commonly known as “death circle“Because ants can eventually die from exhaustion. This has been reproduced in laboratories and in ant colony simulations.[1]
This phenomenon is a side effect of the self-organized structure of ant colonies. Each ant simply follows the ant in front of it, which it acts until a slight deviation is triggered, usually by an environmental trigger, and an ant mill is formed.[2] The ant mill was first described in 1921 by William Beebe, who observed a mill with a circumference of 370 meters (1,210 ft). Each ant took two and a half hours to complete one round.[3] Similar phenomena have also been observed in processionary caterpillars and fish.[4]
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