Agreed. Initially (for no reason, just happened) I had pictured skaths as leathery reptilian... dogs in general. No idea why. I like the ideas, and agree with the general breakdown. I think you can leave "Exotic Ungulates", as just Exotic though. You have the basic groups pretty well down, and outside of those is where the inanity of millions of subskills start to set in. Riding as the over-skill should cover somethings right? Also Insects. Between giant ants, arachnids and the various "-pedes" they'll probably snag a section. Exotic can cover anything that's just extra though.