First off, I do believe, in a great deal of likelihoods. But no one should just swallow anything without first thinking it through a little. This does not mean being cynical and sceptical about everything. It just means let your mind ask the questions it needs answered. Bearing in mind some questions must go unanswered.
Things from "other realms" like Mothmen, Ghosts, Succubi / Incubi, and even other worlds like Aliens are a little harder to answer questions about. The creatures from our world like Big Foot, Loch Ness / Montery Monster, Devil Dragon, Chupacobra, Thunderbirds, Werewolves, Bat people, those will definately create more scepticism. Being that its harder for us to believe such things would have been around us this long, with all our advances, and us not have conclusive evidence on them to this day.
I personally have always been a bit of a fence rider in life, and its no different on this. I have trouble denying certain things, so I'll lean towards believing in those things. Such as S.H.C, Mothmen, Ghosts, UFO's, Aliens, Bermuda Triangle, Etc. But its ones like Big Foot and Nessy I can't swallow down.
I've heard tale the series "The X-Files" was rumored to be based on some actual cases. If this is true, it would show how little we humans honestly know about our surrounding world. Which makes me wonder if we really know anything at all, truly.
To know, is to know that you know nothing. That is the meaning of true knowledge. ~ Socrates