First, there’s the extremely significant fact that the plesiosaur surfaced around 250 million years ago and died out around 66/65 million years ago. Plesiosaurs, the fossil record has conclusively shown, lived in saltwater environments: our planet’s oceans. Loch Ness, however, is a freshwater loch. Yes, there is evidence of the occasional plesiosaur in a freshwater environment all those millions of years ago, but the bulk of the cases are not suggestive of entire colonies of the beasts inhabiting freshwater bodies. It’s far more likely and plausible that they wandered into them and died there. And, yes, there are both a...