User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-71.203.144.9-20121026025415/@comment-4212769-20121026050539

That's I think a very plausible theory.

Only problem I find (after once reading it) in this is that Basarios doesn't live in the 2nd gen Swamp (like you can see in the link, I assume it's right as it is in the wiki). Assuming the 1st gen areas are in another region as the 2nd gen it's also quite unlikely that those Basarios go to the Old Swamp. What do you think? Do those Basarioses have another method to hydrate themselves? If so, why can't Gravios do that and stay in the Volcano, not appearing in the Swamps?

Black Gravios could also be a true subspecies that has all those traits you mentioned. That would mean all of this subspecies are very picky and have a great appetite. Why Black Basarios aren't around could be because they don't live in any of the hunting grounds we know. They also could have better places for hiding and so aren't found easily. Just to add a third option to your theories.