Below is a picture of army ants in a mill. This sketch is from
T C Schneirla (1971) Army Ants, a Study in Social Organization
,
W H Freeman, San Francisco, p 283 Fig 12.4.
This hand drawing was made by Mrs A W Froderstrom from a photo.
Schneirla says that the mill formed when several thousand
army ants were cut off from the rest of the colony by rain, and that
they continued to march in this fruitless formation for more than 30 hours,
until most of them were dead.
Back to my home page.