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.
From what other posters are saying, it may be the other way around? That is, most mammals cannot see green, so it doesn’t matter from a camouflage perspective among mammals. Humans (and primates in general) are an outlier in this repect.
Bird of prey can, though, so there’s that.
Word! That’s cool