User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5043481-20121108191659

I think that most monsters could actually be much smarter than we give them credit for, simply because thier heads are so big. With a brain that size, they won't be completly stupid. Of course, a lot of grey matter does not mean intellegence, but it certainly helps.

It is probable that many monsters have large amounts of brain devoted to smell or other senses, enablin them to make split second decisions.