Pogonomyrmex anergismus & Pogonomyrmex barbatus
Pogonomyrmex anergismus (bottom) is a workerless social parasite of other species of Pogonomyrmex harvester ants. Here a queen tussles with a worker of the host species, P. barbatus. Notice the small size of the parasite compared to a host worker.
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This image was captured with a Canon EOS 20D, using a Canon 65/2.8 MPE 1-5x Macro lens.