The Tarbh Uisge ( "water-bull" in Gaelic) is a spectral water-bull in Scottish mythology.
The Tarbh Uisge is described as a black animal, with a velvety, soft appearance, and no ears at all. Only coming out at night, it is said to make a sound which has been compared to the crowing of a rooster. When local farmers hear that sound they know that this means the Tarbh-Uisge has come to graze in the fields.
The Tarbh Uisge is found only in tiny, isolated pools, which are wedged deep in the mountainous Highland regions of Scotland.