Now this is brand new information related to bird potty. And something I never knew. Product of a nonsensical argument / comment from Adi - my beer brother.
Apparently many species of birds will swallow stones. These aid in digestion because they help grind items in their stomachs.
These stones are called gizzard stones or gastroliths and are usually smooth and round from the polishing action in the animal's stomach.
When too smooth to do their required work, they may be passed or regurgitated.
My advice: The next time you feel somebody has pelted one at your shiner, don't put your hand up to touch the spot. Bird pooh / puke alert ;-) yeesshhhhhh.
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