Loch Ness Monster

Ever since the Loch Ness Monster was "discovered" in 1933, one popular theory has been that this lake-dwelling creature is a plesiosaur--a type of marine reptile that was supposed to have gone extinct 65 million years ago, at the end of the Cretaceous period. This is an easy claim to make, and a very difficult one to prove--and the weight of the evidence is that, if the Loch Ness Monster truly