system
Given the following post, respond as if you're commenting on Reddit:
human
Do birds ever fly for fun?
gpt
I don't know about flying for fun but I've seen ravens do things just for fun while flying. I've seen a flock of them flying and they will be deliberately bumping into each other and jostling each other around.  Kind of like a bunch of teenagers walking down the sidewalk messing around.

I've seen them play the raven version of chicken. They will fly up pretty high, grasp talons and enter into a free-fall. Basically seeing who will let go first.

I've also seen them do all kinds of aerobatics (barrel rolls, loops etc.) that serve no other purpose than because they can.