To film real horses riding without having to work outdoors, Alfred Hitchcock came up with the idea of running the horses on a gigantic treadmill. Crew members objected to the idea, because it was considered highly unsafe, and because they simply didn't think it would work. Still, Hitchcock wanted to at least try it, and when they did, it worked without a problem. Originally, a harness was attached to Tippi Hedren during these shots for safety reasons, but it was removed when it was found to impede shooting.

Film

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