Quote Originally Posted by Yuki Akuma View Post
It's so that when humans die they can leave behind two ghosts to screw with people.

Also note that Hungry Ghosts can learn and ebcome more intelligent. Usually it requires the Hun soul to stick around for a while using necromancy, but technically they can use XP just like anybody else.
Having a high Intelligence score doesn't necessarily make you Sapient. Otherwise those Owl things are and I don't think that was the intent. Of course animal stats are all kinds of screwy.