Birds don’t pee like humans and many other animals. Instead, they manage to work by just pooping.
When we eat food, our bodies take nutrients and produce waste. We release liquid waste as pee (urine) and solid waste as poop. Birds, however, combine both into one substance. The white, pasty part you’ve seen in bird droppings? That’s their version of pee, known scientifically as “uric acid.”
Bird kidneys filter waste from the bloodstream. While human kidneys produce liquid urine, bird kidneys produce a more concentrated substance, uric acid. This system allows birds to save water, which is vital for their survival. Did you know? A pigeon excretes around 0.4 grams of uric acid in one poop. That’s a lot of waste in a tiny package!
So, birds don’t pee like we do. Instead, they mix their pee and poop together and release it all at once. And sometimes, they manage to cover whole islands and mountains in layers of bird poop, called guano. Guano is an excellent fertilizer and provides phosphorus and nitrates to plants. In fact, a small country called Nauru, had the biggest economic glow-up, just by exporting guano. Sadly, uncontrolled export saw them slink off as well. A lesson in sustainability, that too coming from bird poop.
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