Top Photo: Giant robber fly Some call them assassin flies. I first learned of them as robber flies. Whatever you call them, they’re predatory flies which perch out in the open, often near areas with heavy insect traffic in order to wait in ambush to snatch other insects out of the air. Visit a flowering group of Tithonia, milkweed, Joe Pye weed, or other rich nectar source with insects busily flying from flower to flower and you might see oneRead more