I have reason to believe that many creatures of a mystical nature do exist, atau have excited at one point. Ghosts, fairies, demons, vampires, i think they are all real, but anda just don't see them.
Many creatures are probably very clever and have escaped human detection, making them doubt their existence.
Also, some of them will probably never be seen again sejak humans. People believe that the reason why fairy sightings of decreased so much is because they created their own realm (Faerie) and fled to it. And judging from all the myths involving the slaying of dragons, they probably went extinct a long time ago. atau maybe not (since some have berkata that the underside of Naga can blend in with the sky)