When we talk about weird creatures or unexplained creatures, automatically we tend to think creatures that we have never seen it before. In this world, there are a lot of creatures which actually exist but we haven't seen it yet. Some of the creatures we just see it once, then vanish just like that without leaving any prints. In my opinion, the reason that the creatures are not exposing itself is because they never want any people hunt for them. So, its better for them to hide themselves. Lets take an example, Lochness, why until now people still never find any evidence that proves the lochness monster exists. Bigfoot & many other creatures. Sometimes we should ask to ourselves, why we're obsessed with those creatures, we just move on and let it be.