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The use of standard blue screen techniques for doing matte shots of the birds proved to be unacceptable. The rapid movement of the birds, especially their wings, caused excessive blue fringing in the shots. It was determined that the sodium vapor process could be used to do the composites. The only studio in America that was equipped for this process was the Walt Disney studio. Ub Iwerks, who had become the world's leading expert on the sodium vapor process, was assigned to this production.
The scene where Tippi Hedren is ravaged by birds near the end of the movie took a week to shoot. The birds were attached to her clothes by long nylon threads so they could not get away.
The climactic scene, in which Tippi Hedren's character is attacked in the bedroom, took seven days to shoot. Hedren said, "[It was] the worst week of my life." The physical and emotional tolls of filming this scene were so strong on her that production was shut down for a week afterward.
Near the end of the film, when Mitch carries Melanie down the stairs, it is actually Tippi Hedren's stand-in being carried by Rod Taylor. Hedren was in the hospital recovering from exhaustion after a week of shooting the scene where Melanie is trapped in the upstairs room with the birds