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Robber Fly, any of a family of medium to large predatory flies known for their fast flight, excellent vision, and their habit of catching large prey while in flight. Also called assassin flies, they are widely distributed. There are about 5000 species worldwide and about 900 species in North America. I found this monster in my rock garden dining on a wasp. That is one BIG fly! I'm happy it doesn't dine on people.