User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5020152-20120829202114/@comment-4212769-20120902154011

I don't think a mixture of colors would get black with red stings. And I don't think that a monster with the "bad gene mix-up" could get that strong. And as subspecies they won't get infertile as they still can reproduce without problems. An African Lion can reproduce with an Asian Lion, can't it? And why should they just die? :S

As rare monster the male counterpart to Black Rathian could just be very aware of approaching humans like Dyuragaua did before the nest got found. Only because he hasn't appeared in a quest doesn't mean there isn't one. I still would say Black Rathian is a true Subspecies.