They serve as aesthetics,
I think.
I think, too, that flying high just brings in good luck.
It's low-flying that might be bad luck.
But that's
my thinking.
I think flipping helps them escape eagle grabs or
something. But probably not for long. It's good there
are so many of them so that they won't go extinct.
This one could have flipped to fly the other way so the hawk
wouldn't catch up to it.
https://www.youtube.com/watch?v=YkmDKswh1PA