User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6050823-20140107011913/@comment-11112316-20140110052340

I don't find it that absurd to believe the Fatalis could severely reduce the amount of water in an area. We're talking about the same creature who can magically call meteors from the sky, strike people down with lightning, and apparently summon a giant sphere of pure energy while being consumed by magic flames. Besides, we've seen Amastumagatasuchi essentially create a considerably large hurricane around itself; I think it's safe to assume creatures CAN be very influential to the environment.

While it may seem like a vast many new species are being discovered from game to game, I think the more likely case is that the actual number of new species discovered isn't that great: the Guild simply keeps most of the info shut from even hunters (the player characters). Plus, most of the numerical games change locations, so of course it would seem like new species are being discovered to the player, when in actuality those species were already known to that region for a long time. Not to say the Guild is omniscient, but I believe they know a lot, and with all their info they still place Fatalis at the top echelon of threats.