HARRY POTTER AND THE CHAMBER OF SECRETS (2002)
In the scenes where Fawkes the phoenix is not flying it's an animatronic bird made by the props department. The bird was so realistic looking that Richard Harris (Dumbledore) thought it was a real bird even though he was acting right next to it. Between takes he said to the director Chris Columbus, "It's quite amazing how well-trained these animals are these days." Oh, how I miss Richard Harris.