The term "water horse" was originally a name given to the kelpie, a creature similar to the hippocamp, which has the head, neck and mane of a normal horse, legs like a horse, webbed feet, and a long, two-lobed, whale-like tail. The term has also been used as a nickname for lake monsters, particularly Ogopogo and Nessie.[1] The name "kelpie" has often been a nickname for many other Scottish lake monsters, such as each uisge and Morag of Loch Morar and Lizzie of Loch Lochy.[2] Other names for these sea monsters include "seahorse" (not referring to the seahorse fish) and "hippocampus" (which is the genus name for seahorses).
The usage of "water horse" or "kelpie" can often be a source of confusion; some consider the two terms to be synonymous, while others distinguish the water horse as a denizen of lochs and the kelpie of turbulent water such as rivers, fords, and waterfalls. Some authors call one creature of a certain place a kelpie while others call it a water horse. The name "water bull" has been used for either creature.
Flight of King Gradlon: Morvarc'h, the magical steed of King Gradlon of Ys
The Breton King Gradlon's magical "horse of the sea" Morvarc'h (whose name literally means "sea horse" in Breton) was said to have the ability to gallop upon the waves of the sea, in a similar fashion to the water horses of Cornish legend.
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