Well personal experience is all that matters because relying on scientists to find the information is a waste of time. I actually believe that these creatures exist, for the simple fact that there have been many animals discovered that weren't known before. I'm sorry I can't give you a definitive answer but I believe you will find the answer to that question in the future when people decide to become more open minded.
I once heard that the existance of dragons has in fact been proven. The long dead remains of one were found high in a mountain, frozen but still perfectly intact. They thawed and studied it, concluding that it was a dragon carcas. I'm not sure if I myself believe it, but it's very well possible.