Is it though? They have to eat an absolute ton relative to their own mass. At least all the birds I've ever interacted with were constantly eating, even when they mostly didn't bother flying. Chicken soccer is what I called feeding the chickens. No patience whatsoever.

My mother used to say that her sons eat like birds, a peck at a time, and twice our own body weight daily.

While we humans eat a lot, something like 50% of our calories are going to our brains. I'm not sure most birds could actually increase their caloric intake enough to be able to evolve bigger brains than they already have. Maybe if we designed them some super foods, but that seems to be cheating, to me.