well, the definition of mythical is 'occurring in or characteristic of myths or folk tales’ so that means that they probably aren’t real. however I do believe that the myths are based on true creatures. for example, the idea of mermaids came from the sirens of greek mythology (and maybe the naiads/water nymphs, idk) but sailors who knew the stories of mermaids mistook manatees for mermaids.
Well I might crazy ,but I think They are very Real .