Dragons

Dragons are a species of mythical creatures that live in the Land of Ooo. A dragon first appears in "Memories of Boom Boom Mountain." In the episode, the dragon complains that his bottom itches. He breathes fire and has a deep scratchy voice. The issue of his butt itching is resolved when Finn causes some Cactus Creatures to sprout; relieved, the dragon scratches his rear-end on the cacti's thorns. He then proceeds to breathe flames, melting the Ice Cube Creature.

Another dragon appears in "His Hero," chasing the Cobbler and breathing fire at him. In "The Eyes," a dragon is shown to have been slain by Finn.

In "The Silent King," the goblin kingdom is revealed to have a royal dragon stable, showing that there is an entire species of dragons with the same appearance as the ones seen earlier in the series.

Appearance
The dragon's anatomy is not consistent with most portrayals of dragons. It has two sacs on the sides of its neck which appear to be related to its ability to breathe fire, tiny wings for rear legs, and a bottom like that of a baboon. It also has what appears to be a series of teats running the length of its belly, suggesting that it may be a mammal.