Solenopsis invicta (fire ants) & Linepithema humile (Argentine ants), fighting
Two of the most damaging pest ant species worldwide are the Argentine ant L. humile (top left) and the red imported fire ant S. invicta (center). These two species are native to the same flood-plain habitat in the Paraná river drainage of South America. The Paraná drainage hosts a highly competitive ant community that has produced a number of invasive ant species. Both Argentine ants and fire ants are aggresive and fight over resources.
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This image was captured with a Canon EOS 20D, using a Canon 65/2.8 MPE 1-5x Macro lens.