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As many are unaware, humanity is actually composed not only of the "Imperium's finest," but also numerous subspecies of lesser creatures that were once men. These are the result of humans remaining isolated on outpost worlds for centuries. I won't go into the details of why this occurs, but it does. The Imperium is forgiving of some of these creatures: ratmen, ogryns and the like. They have uses. However, one subspecies apparently proved too problematic to shove into isolated military service, out of public view. This subspecies is the Squat.