Why-wolves

The Why-Wolves are characters that appear in the episode "Donny". They are monsters that resemble werewolves, but have a more inquisitive nature, and will sometimes pause to give lectures.

In "Donny", a Why-Wolf describes his species' place in the food chain: The Why-Wolves are usually kept in check by Obnoxygen, a gas produced by Donny the ogre that is deadly to Why-Wolves. However, left unchecked, the Why-Wolves would wipe out the House People and grow in population until they attract the Cosmic Owl, who will devour them.