People are fascinated by the possibility that an animal like the Loch Ness Monster could exist. If an explanation for monster sightings is ever presented, it will probably be based on actual phenomena (but, not necessarily a living creature). Other mysterious creatures, like dragons and unicorns, probably also owe their legends to actual phenomena. Unicorns for instance, are probably based upon a grab bag of real creatures, such as narwhals, and certain species of deer, goats or antelopes that sometimes have only one horn.