Hitchcock didn’t come up with idea for The Birds,it was from a story by Daphne Dumaurier..
Well . . . a seagull stole a piece of calamari from a squid sandwich I was holding. He lived to regret that thievery. And the other day my car was carpet bombed by a squadron of pelicans. On the other hand a pelican allowed me to hold him as I removed a fish hook from his hide, and a fledgling bluebird hopped into my hands. So, it goes both ways.
Thanks you are right, when the incident I recalled Hitch was already filming:
In August 1961, Capitola residents awoke to a scene that seemed straight out of a horror movie. Hordes of seabirds were dive-bombing their homes, crashing into cars and spewing half-digested anchovies onto lawns.
Famed film director Alfred Hitchcock even used the incident as research material for his then-in-progress movie “The Birds,” in which flocks of deranged birds inexplicably attack a coastal town.