The pca is primarily a creature of Irish folklore. Considered to be bringers both of good and bad fortune, they could either help or hinder rural and marine communities. The creatures were said to be shape shifters which could take the appearance of black horses, goats and rabbits. They could also take a human form, but their human forms usually would include various animal features such as ears, tails, horns, etc.

The pca has counterparts throughout the Celtic cultures of Northwest Europe. For instance, in Welsh mythology it is named the pwca and in Cornish the Bucca. In the Channel Islands, the Pouque were said to be fairies who lived near ancient stones; in Channel Island French a Cromlech is referred to as a Pouquele or Pouquelay(e); Poulpiquet and Polpegan are corresponding terms in Brittany.
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