The Orks, also called greenskins, are a savage, warlike, green-skinned species of humanoids who possess physiological features of both animals and fungi who are spread all across the Milky Way Galaxy.
They are seen by their enemies (pretty much everyone else in the universe) as savage, violent, and crude, but they are the most successful species in the whole galaxy, outnumbering possibly every other intelligent starfaring species, even Humanity (with the very plausible exception of the Tyranids).
Greenskins are one of the most dangerous alien races to plague the galaxy. Numerous beyond belief and driven always to fight and conquer, the Orks threaten every single intelligent species of the galaxy.
Orks are possibly the most warlike aliens in the 41st Millennium, and their number is beyond counting. Amid constant, seething tides of battle and bloodshed, burgeoning Ork stellar empires rise and fall.