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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