An unusual event to witness, the death spiral (a.k.a. circular milling)
occurs when ants get separated from the colony and start following the pheromone
trail of other ants in a circular pattern. The ants will continue the death
spiral until they die from exhaustion (unless a lucky few manage to escape).

Ants Circle [via
Geeks are Sexy]

Here is a second video of this phenomenon that we found for you.

dancing ants
[YouTube]

Want to know more? See this interesting bit of information about a 1,200 ft.
circumference ant death spiral observed in 1921.

Ant
Death Spiral
[The Ant Room]




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