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 don’t think the OP claimed fish were mammals
I wasn’t responding to the OP, and yes, you’re right.
Our points are not mutually exclusive.
Edit: Moving quickly while on my cell phone. I meant to reply to this comment.
By making a root level comment you were exclusively responding to OP. So yes you were.
They’re out there but it’s been hard to document their existence since they blend in so well with their environment. This natural camouflage is a double-edged sword, however: they may be able to avoid getting eaten by predators but it also makes reproduction particularly challenging since they have a hard time finding one another to do it like the Discovery channel.
Even when a potential breeding pair are able to meet up, their coupling is far from guaranteed due to the abundance of other green orifices in their usual habitats. Grass-covered mole tunnels, mossy logs with holes in them and bee nests in leafy trees have all been accidental natural fleshlights for these poor creatures. Like they say, it’s not easy being green.
Orions are demonstrably mammals, but unfortunately fictional.
What about the Hulk???
What about Shrek