Andavakoera, Prov. Antsiranana, Madagascar
Mystrium ants have an unusual caste system. They are dimorphic, with a small, red caste that appears to work mostly in the brood nest and a larger, dark caste that performs most of the foraging and guarding of the nest. Interestingly, the ants that perform as reproductive queens are drawn from the smaller caste.
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This image was captured with a Canon EOS D60, with a Canon 65/2.8 MPE 1-5x Macro lens.