The large, black fairy cat of Scottish Gaelic tradition. It has a white spot on its breast, an arched back and erect bristles (crotach agus mùrlach). They are about the size of a dog.
According to Highland tradition, the cat síth was a transformed or disguised witch, not a fairy.
- Campbell, J.G. (1900). Superstitions of the Highlands and Islands of Scotland. Glascow: James MacLehose and Sons, p. 32.