Birds do not produce urine. Instead they excrete uric acid. Their kidneys do extract waste from the bloodstream and this waste comes out in the form of uric acid, which emerges as a thick, white paste. However, the waste is not all white; you could spot brown or green specks in the centre of the white paste, which is the actual bird faeces. Since birds do not have separate urinary and digestive tracts, the uric acid gets expelled along with the faeces.
The way it’s excreted is also a little weird compared to the rest of us. Most bird species don’t have “traditional” penises and vaginas (though there are some bizarre exceptions). Instead, both sexes have a cloaca — an all-purpose entrance and exit for the intestinal, reproductive, and urinary tracts. It’s used to expel waste, lay eggs and have sex (which, for birds, happens in the form of a “cloacal kiss”). This orificial multitasking explains the dark bullseye that’s often in the center of the white acid waste. That’s the actual “poop” part, or stool. Because the acid and poop are expelled at the same time from the same opening, but from two different bodily systems, they don’t have much time to blend, and you get a bird dropping with two distinct parts that looks like a poor man’s Rorschach test.
The acidic attributes of bird poop are a detriment to your car’s paint job, but it’s highly sought after for what it can do to your face. Maybe not your face, but certain celebrities go nuts for bird poop facials, where Japanese Nightingale poop is mixed with rice bran and water and used to exfoliate the skin.
Credit : Mental Floss
Picture Credit : Google
