Blue Jay Uses Special Call to Intimidate Young Cardinal

Blue Jay resorts to the dreaded squeaky gate or rusty "pump handle" call to scare off a young cardinal - sort of like nails on a blackboard. You may remember this young cardinal standing up to a young Blue Jay at: https://youtu.be/MLvZbt7wI08 but this is a mature Blue Jay with no patience. Even still the Cardinal does not give up!