Dragons.

you are going to think I am crazy but thats for you to decide. I know Dragons exist I won't go into how I know this, but I do. There are many different kinds of dragons. You may ask how can they exist without us seeing them. well, the answer is simple. They hide. They are big yes, but they can hide from those whom they wish to remain hidden from. Its not easy to see these amazing creatures because in order to see them you have to believe that they exist. Not just say that you believe, but actually believe that they exist.