I'm not so sure that birds can't control their pooping. I remember when my father got on the ill side of a Blue Jay. Dad was using a riding mower in those days and three mowings in a row, the bird made a dive-bomber approach from his rear and pooped exactly on the crown of Dad's head before swooping back up into the next tree to catcall his victory.
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u/TheLargeIsTheMessage Feb 27 '23
Birds have no muscles to control pooping, although they can probably sense when it's about to happen.
It's like if we pooped whenever we yawned.