Solenopsis invicta (fire ants) & Linepithema humile (Argentine ants), fighting
Two of the most damaging pest ant species worldwide are the Argentine ant L. humile (left) and the red imported fire ant S. invicta (center-right). 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.