I had two siamese cats who almost didn’t want to go outside because a bluejay was always waiting to torture them. Side-splittingly funny. They’d try to jump - 5 feet sometimes - to
rid themselves of him but no dice.
He’d just sit there and taunt them from a young tree outside the door.
Jays are merciless. ;-)
As far as the ‘ninja birds’ (as for cats) the Mockingbirds are somethings else. They don’t take any crap from cats. LOL! And I LOVE listening to them in the morning imitating the songbird calls.