Birds, fish, reptiles, amphibians, insects? Sure. But no mammals.
So I had to google it. Apparently, there is a sloth that moves around so slowly moss grows all over it and it doesn’t care. So it may appear green, but only in the sense that it wears it.
I remember reading an article in a Nickelodeon magazine when I was a kid about a cat that had a genetic defect that gave it green fur. It looked pretty cool.
Crazy. I had to look it up and I found some stuff, including this old web article from 2002 that talks about this cat. The cat’s name was, Miss Greeny, apparently.
There are multiple sources, but there is no wiki page and none of the sources seem well known, so I’m having a hard time figuring out if it’s legit, or just a really good hoax.