He cast her as Melanie Daniels in The Birds, the adaptation of Daphne du Maurier’s 1952 short story about a coastal California town attacked by ordinary birds that have turned inexplicably and lethally aggressive. The concept required a leading actress who could credibly convey the transition from poised sophistication to genuine terror across the film’s runtime, and Hitchcock believed he had found her. The film was Hedren’s screen debut — she was thirty-three years old, had spent thirteen years modeling, and was appearing in her first professional acting role.
The production of The Birds involved technical challenges that the filmmakers worked through systematically, blending mechanical birds, trained birds, and process photography to achieve the various attack sequences. For most of the film, the combination worked well enough. For one sequence — the attack in the upstairs bedroom that was among the film’s most intense scenes — Hitchcock made a decision that Hedren has described as a betrayal.
She had been told the sequence would use mechanical birds. On the day of filming, she arrived on set and learned that the mechanical birds were not going to work, and that live birds would be used instead. For five days, she was attacked by seagulls and ravens that were hurled at her by trainers wearing heavy gloves. The birds were tied by the feet to her costume in some instances. One bird scratched her very close to her eye. By the end of the week she had collapsed from exhaustion. A doctor who examined her ordered a week’s rest. Screenwriter Evan Hunter, who was present for the dailies, described her performance during that sequence as authentic reaction rather than acting: “She wasn’t acting, she was reacting.”