This one is just "for the birds." Just another Hitchcock disappointment: over- and-stilted acting, sloppy direction, and plot development that doesn't make sense or is predictable.
Just among the many, as has been typical for others in this series, it takes people seemingly forever to stop denying the obvious. The farmer's house being ransacked but nothing stolen, dead birds smashed on the floors and and against the windows, and he's hacked to death, eyes eaten, etc. And the police, and others keep saying "well, maybe this, maybe that, but birds don't do this!"
Hundreds of birds flying down the chimney and attacking everybody at the outset in Rod Taylor's home. Well, maybe they were provoked. Maybe they were attracted by the light. Birds don't attack people.
Or the schoolhouse episode where the adults, with hundreds and hundreds of birds gathering outside, decide evacuate the safe building to have the kids run into town a short distance away. The kids are attacked, they're screaming, they're running down Main Street. They're getting bloody.
Next scene is inside the cafe right in town. Nobody noticed it; everyone is in denial that it happened, and suddenly this bird lady expert shows up there to buy cigarettes to insist that birds harm no-one, they don't have the brains to organize a coordinated attack, they're harmless and what's being claimed is repeatedly false. She says that emphatically because she's an expert. More denial.
Ugh! And then the gas pump scene where a man pumping gas for his car is attacked by a bird, he falls to the ground, and the nozzle - instead of automatic shut-off that WAS standard back then, has fallen and is still flooding the ground with loads of gasoline.
And, of course, what happens next? Another car just pulls up but not at a pump, away from the island. But, of course, his car is stopped over the river of gasoline. He gets out, and sure enough, he pulls out a cigar and matches to light it. Apparently, he never smelled gasoline before. The folks inside the cafe see what he's about to do, open a window to yell to stop. Of course, startled, he drops the match and everything explodes.
Ohhhh, what's next. Well it just goes on.
Back at Rod's home, the birds are attacking, and actually beginning to peck through the wood doors and boards over the windows. It's really looking bleak. They're doomed!
But then, it gets quite outside again. They've regrouped, as usual, and preparing for their next attack, as they do.
So it's all quite inside. Then Tippi Heddren is all by herself in the living room for some bizarre reason. And she hears "funny noises" somewhere upstairs. So she decides to investigate all by herself, slowly climbs the stairs, finds a closed door with the sounds behind it - that happen to sound just like birds.
So, what does she do? Of course! She slowly enters the room to investigate. Sure enough, she's attacked by hundreds of killer birds. Plenty if blood. She finally collapses and is gonna die!
But, of course, she's saved at the last minute. But she's in total shock. Rod decides they all need to evacuate and get Tippi to a hospital in San Francisco. In spite of how Tippi was attacked during the "quite period" upstairs, he decides to slowly and slowly safely walk through the many hundreds of birds resting just outside, get the car, they all get away, and the scene fades as the car drives away. Which he successfully did; no real problems except for a few pecks to excite the audience.
With no conclusion about anything. Does he get the girl? Does she even survive? What resolved the birds overtaking the world? Or did they?