User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6005381-20130203132053/@comment-4212769-20130203133503

But why is it so much stronger then? A genetic mutation only affects the genes that mutates (obviously), mostly only a few genes and not a whole DNA strands. And normally the parents still care for them or they wouldn't get adult. If you saw how helpless a Rath chick is (Rathian Ecology Video in MHFU) they wouldn't survive for sure when they wouldn't have been cared for.

Very unlikely that the black Rathian is just a genetic mutation.