The Birds (1963)

As beautiful socialite Melanie Daniels rolls into Bodega Bay in pursuit of eligible bachelor Mitch Brenner, she is inexplicably attacked by a seagull. Suddenly thousands of birds are flocking into town, preying on school children and residents in a terrifying series of attacks. Soon Mitch and Melanie are fighting for their lives against a deadly force that can't be explained and can't be stopped.