MONSTERS

There are two interesting things about the Loch Ness Monster and Abominable Snowman. First, while they are definitely seen, there is little evidence of them being physical. And second, they have cousins in most wildernesses worldwide. This suggests they could be a universally produced form of hallucination. But why?
They seem to represent two periods of evolution. First, the time when life broke the surface of the water and saw the sky, and second, when the primate left the trees and walked among predators. Both fearful times, such memories seem to stay in the mind. So could we be witnessing evolutionary memories, perhaps handed down through DNA, from our evolutionary past?