Kelpie

The kelpie is a supernatural water horse from Celtic folklore that is believed to haunt the rivers and lochs of Scotland and Ireland.

Its hide was supposed to be black (though in some stories it was white), and will appear to be a lost pony, but can be identified by its constantly dripping mane. Its skin is like that of a seal, smooth, but is as cold as death when touched. The horse's appearance is strong, powerful, and breathtaking. Water horses are also known to transform into handsome men in order to lure women into their traps. It is understood that the nostril of the horse is what creates the illusion of grandeur. The water horse also creates illusions to keep itself hidden, keeping only its eye above water to scout the surface, much like the illusion of a fish's pupil. It is wise to keep away from them. If a human climbs on the back of a water horse, the horse will often dive into the water and drown its rider. If a human gains control over the horse it can be put to work in fields. Water Horses have the strength of ten land horses and do not like to be enslaved and will try every trick to escape. The water horse then courts its master for several years before it consumes only the left leg and right hand pinky finger of the victim.The water horse is also a common form of the kelpie, said to lure mortals, especially children, into the water to drown and eat them. It performs this act by encouraging children to ride on its back. Once its victims fall into its trap, the kelpie's skin becomes adhesive and it bears them into the river, dragging them to the bottom of the water and devouring them - except the heart or liver.