Right, so after the humans lost the humo-forunno war they were devolved by their masters. I'm assuming all knowledge was removed, the planet was set back, and the humans were... see that's the problem. The fores would have had to genetically modify humans to make them hairy, if they weren't. And if they went through such trouble to genetically modify humans, I don't understand why they let humans live in the first place. Or, they would have had to wipe human memories, right? Everyone would try to entice a rebellion and build back infrastructure, wouldn't they? (Well, after a few considerable Millennium.)