Dragon

History
Dragons are horned reptiles with long, scaly bodies that end in a thin tail. It has four short legs and very large wings that enable it to fly quickly over great distances. The dragon's head is large compared to the rest of its body. Its bearded face is dominated by a wide, flat nose and golden, cat-like eyes. The audience mostly sees the dragon in spirit form, so it's difficult to tell whether the telepathic capabilities it exhibited were with it when it was living in the material world. Dragons can breathe fire, a fitting example in the Avatar world, as Firebending comes from the breath. There seems to be many types of colors of dragons as seen in "The Earth King." Fang is the most well known dragon, this dragon is Avatar Roku’s animal guide. Fire Lord Sozin also had a vicious gray-blue dragon. A real dragon has not been seen in the series present time, they might even be extinct.

A Dragon was first seen in "The Spirit World (Winter Solstice, Part 1)."

Connection
The dragon of the Avatar world seems to be based mostly on the Chinese dragon, but with the inclusion of wings, a more common trait in the European dragon. In Chinese mythology, dragons are traditionally mixtures of lizards, camels, goats, and bats, among other animals.