Yep, a really big source was bat guano from caves. But, I have also heard that the dirt from old outhouses.
Here are a couple of videos. One about human and one about chicken poop.
https://youtu.be/pDDkobptsPA?feature=shared
https://youtu.be/6w2cwJmVNbU?feature=shared
But for real you want old composted poop. Not fresh stinky poop.
Humor, jokes, memes about TTRPGs
Yep, a really big source was bat guano from caves. But, I have also heard that the dirt from old outhouses.
Here are a couple of videos. One about human and one about chicken poop.
https://youtu.be/pDDkobptsPA?feature=shared
https://youtu.be/6w2cwJmVNbU?feature=shared
But for real you want old composted poop. Not fresh stinky poop.