It is amazing; I saw it, or something VERY similar, about a year ago, and was really impressed by the bird's ingenuity. Just not sure whether it's Corvus monedula or Corvus corone cornix, but I'd say it's the former; both are really clever, but the first one can do miracles, understand human speech, to a certain degree of course, and I've heard that some can even learn a few words. Thanks for sharing.