In Scottish Mythology, The Each Uisge, is a name for the Highland supernatural water horse, supposedly the most dangerous of the water dwelling creatures. The monster inhabited the sea, sea lochs and fresh water lochs and is sometimes mistaken in writing as the Kelpie, which is supposed to inhabit rivers and streams.
The Each Uisge had the ability to shape shift, and could disguise itself as a fine horse or pony. To lure people into the water it would stand by the waters edge in one of these forms, and wait for somebody to approach. If a man was to mount the horse, it would immediately set off into the deepest part of the loch, the rider being unable to free himself because of the adhesive qualities of the creature's skin.
Once in its element, the unfortunate victim would drown, and be devoured completely apart from the liver, which would float ashore, a sure sign that the water horse had claimed another victim.