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Hell ants have two features found in no living species : highly specialized scythe-like mandibles and a wide diversity of horns that are present on what is essentially the forehead, one reason these fossils are compelling is that, today, we have about 15,000 known species of ants with all kinds of adaptations, from agricultural leaf-cutter ants with scissor-like mouthparts to army ants specialized as nomadic predatory raiders.