A company called Clear Flight Solutions has developed a robotic bird of prey or raptor, that was designed to scare other birds away from flight paths at airports or to be used, kind of like a flying scarecrow over croplands. So far the flight of this robotic raptor is not completely autonomous but that will be coming soon. The possibilities for this type of flying robot are endless, it's something much different than your flying drone and I would imagine, if you saw it flying overhead, you wouldn't give it another thought.
http://www.gizmag.com/...