The Knocker, Knacker, Bwca (Welsh), Bucca (Cornish) or Tommyknocker (US) is a mythical creature in Welsh, Cornish and Devon folklore. They are the equivalent of Irish leprechauns and English and Scottish brownies. The Cornish described these creatures as little people who were two feet tall, had big heads, long arms, wrinkled faces, and white whiskers. They wear tiny versions of standard miner’s garb and commit random mischief, such as stealing miners’ unattended tools and food.