My city has these kite-like predatory bird -resembling bird-scare things on some buildings. Hawk-shaped kite tied on a length of string to a building roof. When

My city has these kite-like predatory bird -resembling bird-scare things on some buildings. Hawk-shaped kite tied on a length of string to a building roof. When the wind picks up, it animates the kite to look like a predatory bird hovering. Very effective.