User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4775842-20120602160611

One thing I've been stumped on is how several supspecies have managed to begin living in such radically different environments than their 'ancestor' counterparts. Take the barioth for example. The regular barioth lives in subzero temperatures, meaning it's developed to trap heat inside of it's body much more effectively than monsters living closer to the equator. The barioth sub is just the opposite. To live in a place as harsh as the desert, it would require a way to ward off heat during the day, since it can be fought at this time, without getting heatstroke. Because bari and bari subs are only different colors and there aren't any real differences in the overall design, I can't explain how a creature that lives in below 0 temperatures could evolve as fast as it has with so little change into a creature that can survive in temp over 100 (Deserts can get hotter than 100F). The same goes for the agnaktor and barroth subspecies. If anything, the agnaktor sub is even less beleivable. Barroth is slightly more plausible (by just a bit of a smidge). It's these subspecies that seem to make the way other subspecies such as gravios or raths more difficult to explain.