According to actor Rod Taylor, the seagulls were fed a mixture of wheat and whiskey to get them to stay still for long periods of time. Birds were lining up outside the studio door to audition for these roles. (Source)

To attract the birds to the actors, they had ground meat and anchovies smeared on their hands. Anchovies, yum. (Source)

Just when you thought it was safe to go back outside, after the film's London premiere, the sadistic theater owners put loudspeakers in the trees just outside the theater and played sounds of birds screeching and wings flapping. (Source)

Catching live ravens and crows to use and train was way harder than you'd think. There wasn't time to hatch the birds and train them from birth. Bird trainer Ray Berwick offered $10 per bird to anyone who could supply the birds. No one could. Finally, they resorted to stalking and trapping the birds themselves. It took four months. About a dozen crew members spent time in the hospital for bird injuries. Plus, almost everyone got a case of lice from the birds, who were infested. (Source)

Tippi Hedren, the actress who played Melanie, is now an animal rights activist who founded a wildlife refuge where she helps look after rescued lions and tigers. Guess she's not taking any more chances offending the animal kingdom. (Source)