User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-2248808-20110826032448/@comment-77.126.115.121-20110916193216

I had a theory about Ancient Rathian since she was revealed. In ancient times the population of Rathalos was low and some Rathians mated with different types of wyverns which expains its attacks and (relative to the regular ones) rarity (most hybrids are infertile).