Winder

Winders are centipede-like monsters appearing in Phantom Hourglass. 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.