In Northern Monterey Bay in Northern California in 1961, the region found itself inundated with crazed birds. They flew into buildings, seemed disoriented, and the ground was littered with their carcasses. Alfred Hitchcock heard of this "attack" when he was developing this movie, and incorporated much of this incident in his film. The same region experienced the same problem in 1991. Turns out that single celled algae will occasionally become toxic. It works its way up the food chain to the fish that the sea birds eat. None of the other animals are bothered by this toxin, but it has a devastating effect on birds. It causes disorientation, seizures and even death. The dead birds in 1961 weren't tested, but a lab had a sample of a small organism that fed on algae from 1961, so that specimen was tested. It was rife with the toxin.

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