User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.240.186.117-20121121110627/@comment-4212769-20121128042602

How can you be that sure?

Fact is, they live in exactly the same environments and their different way of styles would be pretty rewardful in raising youngs.

Also Black Diablos, Red Lavasioth and the Hypnocatrices show that "subspecies" doesn't always mean subspecies. So why can't it be like this here only that the so-called "subspecies" is actually the male/female of the other one?

Furthermore as they are different in some way but you can see they're both a Nargacuga it can be easily mistaken to be a subspecies. And as Nargacuga is a very elusive monster it might be not found out any soon.

I have to admit that having two species living in the same environment being that close related still have a different niche as diurnal and nocturnal predator respectively is very interesting. But this doesn't deny that my theory is possible and plausible.