User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-1758220-20111222010738/@comment-1984048-20120105073735

If you think of Tigrex though, MHF2's story was all about the Tigrex being in a colder habitat that it was not supposed to be in but, in fact, came there due to the food source. So I can't really say the same for the Narga but if these Tigrexs came to Moga in search of more food then it could be more of an involuntary migration. The others like Los could have adapted already to these new environments and have, through some generations, changed physical structure already. This thought though leads to the hypothesis that Narga and Tigrex are really new to Moga and have not changed physical appearance other than Subs....or that's all a flop and Capcom messed up.