Birds are used to being the only bird-sized things in the sky. They also have sharp beaks and no morals. No other flying thing stands a chance. Unfortunately for those Amazon delivery drones that may or may not be in our future, territorial aggression + tiny flying robots = undelivered packages. As Slate points out, people with model planes and helicopters have been battling birds for airspace for years, and these package drones would probably face a similar struggle. Read more at Slate. In the above video, a mans radio-controlled drone was attacked by a flock of birds. The birds