While looking up bird references today, I discovered something hilarious: Anting. Apparently it's a normal thing for lots of species of birds to find a writhing anthill, flop upon it like a discarded rear-end, and just
for a while.
Bluejays do it, crows do it, robins do it, even a few birds of prey do it. Nobody's quite sure why, but they're more likely to do it while hungry.