Yesterday, I noticed that two of the ants on top of the feeder seemed to be having a dispute. I am not sure what was at stake; it is possible that they were workers representing two different nests or colonies. The ants had locked their jaws together and were pushing each other with their antennae waving at each other.
On it went, with the ants pushing each other all around the top of the feeder. At times their movements seemed almost like a dance. Finally, one seemed to gain the upper hand and pushed the other off the feeder.