Urohidrosis

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Urohidrosis (sometimes misspelled "urohydrosis") is the habit in some birds of defecating onto the scaly portions of the legs as a cooling mechanism, using evaporative cooling of the fluids. Birds' droppings consist of both feces and urine, which are excreted together through the cloaca.

Excerpt from the Wikipedia article “Urohidrosis”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: putneymark, CC BY-SA 2.0, via Wikimedia Commons.