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I always assumed it was a "No real reason" thing, like the zombies in Romero's movies.
It could be like Kingdonm of the Spiders, where they were out for revenge (they were out for revenge in that, right?). Maybe a pathogen? something in the air? Solar flair?
Oo, here is a good theory, all birds do at least some navigation by "feeling" the magnetic fields around the earth, maybe there was a change that affected them and made them insanely aggressive....
Of course, something like that would also imply that salmon and elk would become violent as well. Maybe they did, and it just never came up in the story sicne it was set at Bodega Bay in california (My dad heard the stroy for the first time on a camping trip as a boyscout, to Bodega Bay. He was from Oakland). The other explanation could be that the magnetic effects only affected avians.makes you wonder, were people in other parts of the world attacked by ostriches, emus and kiwis? What about angry Penguins?
I imagine swarms of pissed off hummingbirds would suck as well.
Someone needs to make a modern remake of this, just to see what kind of weird shit they come up with....
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