The each uisge (literally "water horse") is a Scottish water spirit, in Ireland called the Aughisky, and is similar with the kelpie, but far more dangerous.
After the each uisge carried the unsuspecting victim into the water, it would tear the victim apart and devour the entire body except for the liver. As long as the each uisge is ridden in the interior, he is rather harmless. But the merest glimpse or smell of water would mean the end of the rider. The creature assumes human shape, woos maidens, and can be recognized only by the water weeds in his hair.