The director was said to have based the 1963 film on a creepy incident in California, where flocks of frenzied, dying birds flew into the windows of homes in Monterey Bay.
Scientists have come up with an answer for the freak of nature - that the birds had been poisoned by toxic plankton.
'I am pretty convinced that the birds were poisoned,' said ocean environmentalist Sibel Bargu of Louisiana State University in Baton Rouge to USA Today.
The scientists came up with the theory after studying the stomach contents of marine life from the time of the birds' deaths in 1961. They discovered toxic algae on three-quarters of the plankton the birds ate which damaged nerves - causing seizures, disorientation and finally, death.
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