User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5460283-20121201174351/@comment-5460283-20121204024005

BTW megalodon went extinct from a sudden climate change.

Secondly it does not necessarily apply to furogi because they don't compete in all  aspects that overlap with larger predators.And don't forget they also come from the F.Forest so they could just be in the Volcano for mating/migratorial purposes.

Thirdly if it was an actual rathian it should be more common because to create a generation that would have a better chance to survive rathalos would want to mate with a powerful rathian so they would make a strong generation.