Pheidole sp. - big-headed ant
They might not look it, but these two ants are sisters. Pheidole species have impressive caste differences among nestmates, with large workers specializing in the grinding of seeds and dissembly of large prey items and the small workers handling brood care, nest maintenance, and other tasks.
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This image was captured with a Canon EOS D60, using a Canon 65/2.8 MPE 1-5x Macro lens.