User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-184612-20150126055153/@comment-1712810-20150126071424

Hmmm... my main theory on this is, Ukanlos and Akantor are pretty much within the same league as Elder Dragons when it comes to the type of challenge they present in-game... They're both big time bosses with plenty of HP and usually their own battle arena (that's shared with a few other dragons or wyverns).

Personally, I think they fit in better with dragons, rather than wyverns...