Animals though have been seeking out mind altering substances for all we can determine, for as long as there were mind altering substances.
The oldest human religions used and still use mild altering substances, it is Christianity which is weird for shunning them (and most of where the abstinence drive comes from) and it was mostly xenophobia targeted against non Christians.
Psilocybin is often just taken by eating mushrooms, when it isn’t, a little isolation and purification doesn’t make much difference.
So saying "it's natural" is bs.
Probably not cows and pigs though. Maybe sobe birds. Maybe monkeys. Raw. Also no significant natural resistance to salmonella.
I'm sure I have exactly as much genetic adaptations to eating psylocybin mushrooms as I have for eating death caps.
Same could be said about death cap mushrooms. Something being natural or even being occasionally ingested doesn't make it any better. Natural, occasionally ingested organisms can kill you on the spot.