The cartoon series Gravity Falls is full of all sorts of strange mythical creatures for our heroes Mable and Dipper to discover and one of those creatures is Flying Skulls. A Flying Skull is a bat-like creature that can be found in Gravity Falls, Oregon, that frequently appear as enemies of our heroes. Flying Skulls look like a skull with one glowing eye, bat-like wings, and two large fangs but no lower jaw. Flying Skulls can even be seen on postcards that Dipper and Mable sent back home to their parents. And Gravity Falls series are full of them, flying skulls can be seen in many episodes and often appear as a background object in Gruncles Stan's Mystery Shack. A fanart Gravity Falls cartoon progress bar for YouTube with Flying Skull.