User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-6050823-20130917011411

Things you may not know about Shagaru Magara(My sources was mh3neko, and a bit of trinfo's twitter along with some other people that posted on their twitter)

The name of the area that Shagaru Magara is fought in is the 禁足地, a forbidden area near Shinato Village.

Shagaru Magara is considered to be the " Punishing God of the Mountain"/山の神が懲らしめた(I could be wrong).

Like we thought Shagaru Magara is Goa Magara's True Form/Adult Form and is part of Goa Magara's life cycle. Also Shagaru Magara has not finished its growth. It turns out after alittle while its hide turns alot harder after and its much brighter colors(Sees Shagaru Magara Subspecies coming in the future).

After molting it seeks well hidden areas were very few monsters come(In this cause the Heavenly Mountains)were it stays until its hide hardens enough but, after molting a large amount of its scales and hairs are left over and winds pick them up bring them to other areas(Causing the virus outbreak).

I'll see if I can find more information on it and on Shinato Village.