Winder

Winders, also known as Moldola, are centipede-like monsters appearing in Phantom Hourglass and Spirit Tracks. These electrically charged monsters travel along walls, and so much as touching one can hurt Link. These creatures cannot be defeated, so it is best to ignore them.

Trivia

 * Winders originally debuted in A Link to the Past. There they appeared to be a moving row of fireballs that moved along the wall. They also appeared in The Minish Cap acting the same way.