Pterodactyl

The Pterodactyl is a flying beast from a land trapped in time that kidnaps Mabel's pet pig Waddles. Pterosaurs are flying reptiles from the late Triassic era (220 million years ago) to the end of the Cretaceous era (65 million years ago).

History
In the opening theme, a picture of the pterodactyl can be seen in a photo.

In "Land Before Swine," the pterodactyl, having escaped from a  prison of tree sap, rips off the roof of a cop car and flies by the moon. The next day, it grabs and flies off with Waddles. The Pines family, Soos, and Old Man McGucket go after him.

As reported in an article by Toby Determined, the pterodactyl snatched sheep in the past. Also, it's implied the pterodactyl had abducted several local miners. Further evidence of human bones belonging to miners in the caves and in its nest, suggest they were killed and eaten.

Appearance
The Pterodactyl has a large wingspan. It has two lizard-like eyes, a pointy skull, and a long beak with two sharp teeth. It also has a long tail and sharp talons. A baby pterodactyl, which hatches from an egg in a nest, looks like a small version of the adult.

Trivia

 * It was animated by James Baxter, who also worked on the movie "Spirit: Stallion of the Cimarron" and was a guest star in an episode of Adventure Time dedicated to him: "James Baxter the Horse."
 * There is also a fake pterosaur in the Mystery Shack.
 * The characters consider the Pterodactyl as a species of "dinosaur" despite the fact that pterosaurs are not dinosaurs at all (though closely related), they are flying reptiles.
 * Despite the creature being called a "pterodactyl," "pterosaur" or "pteranodon" would be correct. "Pterodactyl" is a term the public uses to describe Pterosaurs.