An ant mill is an observed phenomenon in which a group of army ants separated from the main foraging party lose the pheromone track and begin to follow one another, forming a continuously rotating circle. The ants will eventually die of exhaustion. This has been reproduced in laboratories and the behaviour has also been produced in ant colony simulations. This phenomenon is a side effect of the self-organizing structure of ant colonies. Each ant follows the ant in front of it, and this will work until something goes wrong and an ant mill forms. An ant mill was first described by William Beebe in 1921 who observed a mill 1,200 feet (365 m) in circumference. It took each ant 2.5 hours to make one revolution. Similar phenomena have been noted in processionary caterpillars and fish.
See also 
- Delsuc F (2003). "Army Ants Trapped by Their Evolutionary History". PLoS Biology 1 (2): e37. doi:10.1371/journal.pbio.0000037. PMC 261877. PMID 14624241.
- Cozin ID & NR Franks (2003). "Self-organized lane formation and optimized traffic flow in army ants". Proc. R. Soc. Lond. B 270 (1511): 139–146. doi:10.1098/rspb.2002.2210. PMC 1691225. PMID 12590751.
- Wisdom of the Crowds by James Surowiecki
- Schneirla TC (1944). "A unique case of circular milling in ants, considered in relation to trail following and the general problem of orientation". Am. Mus. Novit. 1253: 1–26. hdl:2246/3733.
- Ant mill videos:
- A software simulation of an ant mill (Russian)
- A single ant running in circles
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