Mojave National Preserve, California, USA
Continuous size polymorphism among workers in a nest of Camponotus sansabeanus. Workers differ not only is size alone but in proportion- the head of the largest worker is much larger in proportion to its body than that of the smallest worker.
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This image was captured with a Canon EOS D60, using a Canon 65/2.8 MPE 1-5x Macro lens.