Lion turtle

The lion turtle is a gigantic, ancient creature who has existed since the beginning of time, and is one of the few known animals to have lived in the era of Raava. He is also the supporting character in Avatar: The Last Airbender. This lion turtle is the last of his kind, as the rest of the lion turtles were hunted and killed thousands of years before the Hundred Year War.

Aang communed with his past lives in hopes of finding a way to end the Hundred Year War while on the lion turtle. After the previous Avatars failed to provide Aang with a satisfying solution, the lion turtle revealed to him the power to bend the energy within oneself, which the Avatar later used to remove Fire Lord Ozai's bending abilities.

Having lived for eons, a large forest had sprouted on the lion turtle's back. He prefers to stay hidden from the rest of the world, and submerges his head underwater in order to appear like an ordinary island.