Nargles were known to infest mistletoe, and to be mischievous thieves. Luna Lovegood claimed that her Butterbeer cork necklace kept the Nargles away and that her papers and shoes were taken by Nargles.

What the heck is a Nargle?

First conclusively discovered (and thus named) by magizoologist Luna Lovegood, Nargles are sometimes called Fae-Birds, and are found in North America. ... Nonetheless, due to the fact they lay delicately shelled eggs in nests, and their beaks, they are referred to as birds.

How do Nargles look?

The Nargle is a creature with light purple to black skin. Nargles have two thin arms and legs with long fingers and toes. Their bodies are seven inches long and three inches wide. Nargles have bat-like ears, large white eyes, pointy noses, and sharp teeth.