Plenty of bacteria lives in your guts feeding on your food and generating useful by-products.

How do you know they didn't? When was the last time you just let bugs spend time on you?

In a Sense, cats did actually. Not through direct contact, but by getting rid of mice and rats that infiltrate food storage.

Can we squint and say the gut microbiome is kind of like this?

There are many Garra rufa subspecies that were the source of compounds used in treating modern autoimmune and skin disorders.

The fishes histories go back thousands of years. As a species it is super interesting... some evolved in hot-spring conditions that would simply cook most other animals. =3

https://en.wikipedia.org/wiki/Red_garra

https://www.youtube.com/watch?v=CLWkojAnyH0

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