I think most students are copying/pasting instructions to GPT, not uploading documents.

A few years ago, I started a sentence in my class with “When I was born”. A student instantly chimed in and said “What in the 19’s?” And I thought in my head, of course you idiot, everybody is born in the 19’s. It still haunts me.

I think you’re right that they regurgitate food for their young like most birds. A unique puke related vulture fact is that they projectile vomit at predators as a deterrent and means of dropping weight to flee after they’ve been gorging on a carcass.