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.
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.