If I had to pick a favorite army ant, it'd probably be the tank-like Nomamyrmex , a small genus of brutish ants found from south Texas to northern Argentina. These heavily armored ants are specialist predators of other large, well-defended ants. Here, a worker N. esenbeckii carries a vanquished major worker of a Pheidole. Monte Verde, Minas Gerais, Brazil.
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