Well, back in the middle ages, hides would be subjected to a process using plant matter containing tannin. This toughened the hide producing leather. This isn't an evolutionary trait, otherwise cattle and such would be bred that way. This way we have shoes. Now, about HUMOUR?
Here’s a deal - you explain “tanning” to me, and I will explain “humour.”https://twitter.com/AnalSystemist/status/1080603056243388416 …
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