Surbile

The Surbile is a creature belonging to the Sardinian folklore. She’s an evil witch that, like Pamphile in the Metamorphoses, is able to shape-shift into a fly or a cat. In this way she silently suck the blood out of newborns killing them in their crib. The legend says that the child could be saved placing near his head a comb with more than seven teeth. As the Surbile can only count up to seven she would be confused by the number of the teeth. She would keep counting until the morning, when the sunrise would finally cast her away.