The cat-sìth, in Irish cat sí, is a fairy creature from Celtic mythology, said to resemble a large black cat with a white spot on its chest that walks on its hind legs. Legend has it that the spectral cat haunts the Scottish Highlands. The legends surrounding this creature are more common in Scottish folklore, but a few occur in Irish. Some common folklore suggested that the cat-sìth was not a fairy, but a witch that could transform into a cat nine times.