Yes, 'The Birds' was based on a short story by Daphne du Maurier. The short story has the same name as the movie. It's a very suspenseful and eerie story that was a great source for the movie adaptation.
In the 'for the birds short story', perhaps it tells a tale of characters who are engaged in activities that are only beneficial to themselves in a rather self - centered way. For example, if it's about birds, they might be hoarding food while others are starving. This would be a story that shows the consequences of selfishness.
Not really. 'Yellow Birds' is mostly a fictional creation with elements that may draw inspiration from various sources but not a direct account of real events.
The movie 'The Birds' isn't based on real events. It was purely a work of fiction that Hitchcock crafted to thrill and scare audiences with a unique concept.