.... Loch Ness monster.
Probably the most famous of all mythical creatures. The theories surrounding this even have theories surrounding them! Whatever your views are on mythical creatures I think you have to admit this one is the most plausible, There are far too many sigthings for this not to real. And whilst this isn't really witchy it does show us that we don't know all of the answers, or have the proof about everything, even though we think me might do.