Metrius contractus - Bombardier Beetle
The bombardier defensive mechanism- an explosive mix of chemicals expelled from the rear of the beetle- is found in at least two different groups of ground beetles. The most well-known bombardiers are the colorful Brachinus species, but Metrius and related paussine beetles possess a similar behavior.
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This image was captured with a Canon EOS 20D, with a Canon 65/2.8 MPE 1-5x Macro lens.