Haha.There has been talk about the potential of animals realizing it is fake and possibly creating a new call. The experiments are usually kept short to avoid this and to protect the robo-raptor. Here is a video with the lead researcher that shows a bit more of the experiment with a different owl. Some birds are very territorial, especially when nesting and there have been cases of them banding together to try and scare off the robo-raptor. You can see this towards the end of this video. There is also a video somewhere of smaller birds attacking the roboraptors to scare them off, but I can't seem to locate it right now.