User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6005381-20130203132053/@comment-969093-20130205003850

Capcom never called the (as I dubbed it back then) Ancient Rathian as such. They have given it the name of Unknown. It looks like a Rathian and is a flying wyvern but that doesn't mean it is one by default.

I also wouldn't go with the Gender-HC theory. HC Gogomoa for instance still have their babies on their back. Unless both parents take care of their siblings that theory is an instant no if we go by this example. Hard to tell what kind of parenting role both members take though. Who says they even stay together to begin with?

HC and Hashu variations of monsters being elderly and more experienced individuals is very well possible. I don't think we can speak of different species here. Not sure about mutation. Hashu Pariapuria uses its gastric arsenal on a whole different level than both the normal and HC one.

On the subject of Odeibatorasu however, HC and Hashu works differently. Hashu shoots giant rocks into the air in a 5-point star pattern. HC is definitely also capable of doing that. Difference in age and experience seems unlikely in this case. Can't say the same for Hashu Dora and Unknown though.