User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-11537809-20130928135123/@comment-6050823-20130928144847

Actually, Barroth appears in Moga due to long droughts in the Sandy Plains and Great Wroggi appears in seacrh of new hunting grounds. They actually gave reasons why some monsters appear in Moga and I even posted them on the Theory Blog.