User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4674269-20120208030247

Ok I got something VERY crazy in mind. Yama is a very large, ancient creature that lives in the air for strange unknown reasons. Most Flying, Bird, and Piscine wyverns have wings or structures that may have been wings at some point, despite most lacking the ability to fly or don't often and spend most time on the ground. Another thing to point out is the major lack in land built (Brute Wyverns, Pelagus, Herbivores, etc). Now here's where I'm getting at. Perhaps long ago in the MH world (Before Human/Wyverian civilization), there was a mass extinction that wiped out most land dwelling life forms, most likely in the form of a great flood. To survive, a lot of species would have to evolve various methods to survive such flight (Flying/Bird Wyverns, Elder Dragons, Yama Tsukami) or life in the ocean (Leviathans, Piscine Wyverns, Caparcions, Ceadeus). Only the most strongest built animals on land would have been able to survive as well (Jho, Barroth, Uragaan, Braci, Abrorugu, Lao). When the flood finally ended, new environments would have been formed and survivors would fill in the open niches on land(Ex: Desert-(Ocean) Jhen, Cephadrome, Delex, Hapurubokka, Hermitaur, (Air) Mono(Di)blos Volcano-(Ocean) Lavasioth, Agnaktor, Ceanataur, (Air) Gravios, Akantor). While this was going on, Pelagus, Lynians, and humans would begun to develop and also take advantage of the available niches (Only Lynians and humans would eventually civilize).