Hipposudoric acid

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What Wikipedia says

Hipposudoric acid is a red pigment found in the skin secretions of the hippopotamus; although the secretions are often known as "blood sweat" (thus the name "hipposudoric", referring to "hippo sweat"), they are neither blood nor sweat.

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

Image: Edgar181, Public domain, via Wikimedia Commons.