User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-21371438-20130920092409/@comment-5020152-20130920115050

Monsters don't change their family or species when they grow up, same with real-life animals... that's like saying tadpoles are fish that become amphibians when they grow up.

Goa Magara is definitely an Elder Dragon if Shagara is one. Sorry to contradict your theory, but that's the most likely case.

On a side note, I want to bid you welcome to the Monster Hunter Wiki and let you know that I'm here if you ever need help :)