Apparently, this is a "leaf-footed bug," possibly of the Acanthocephala genus. Thanks to Josh Hillman for the information. Josh goes on to say, "Despite the alarming helicopter-like sounds they make when doing a fly-by, leaf-footed bugs are completely harmless (though not to plants), but if mishandled, they do release a pungent odor to ward off potential predators."

Canon 20D, Canon 70-200mm 2.8IS


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