User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4639789-20120308191341/@comment-4731324-20120310030842

Well, MH3fan, this is where the Monster Hunter Universe would really come into play.

Apparently, the monsters in their world are -extremely- resilient. The subspecies are the biggest examples (You sometimes find them in extreme opposite environments, i.e. barioth and agnaktor). So, for them to find a way to adapt to and survive in their new environment isn't really that unbelievable.