The ant galaxy lacks a dark matter halo, you can tell by the rotation difference between the center and outer edge. Instead, it's fear that holds them together, the fear we all feel when we ponder them in our eyes.
This is sometimes known as an Ant Vortex. It occurs when a number of ants within a colony marauding army ants accidentally crosses its own path and identifies the existing chemical trail as the route defined by those ahead of it in the column. They follow the misidentified trail, now a closed loop, and reinforce it for other ants.
The confused ants will circle continuously in a slowly tightening circle until they die of exhaustion.
These can also be induced by placing a circular barrier around a large troupe/herd/whatever of ants long enough for them to establish the pattern. Remove the barrier and they'll keep on going.
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