A few weeks ago we shared a photo of two robber flies and the following description from the Kaufman Field Guide to Insects of North America: robber flies “are to other insects what falcons are to other birds: swift predators on the wing.” Here a robber fly enjoys a white butterfly, the most recent victim of its aerial predation. Before this scene, the fly was likely perched on a log, foliage, twig, or the ground, and dashed out to apprehend it. There are about 1,000 different species of robber flies, many looking similar to the one in this picture.
Photo by Glenn Marangelo on 7/25/20 near St. Regis, MT.