Sea lion

A sea lion was first seen transporting Azula, Mai, Ty Lee and Zuko to Ember Island. A large and strong animal, the sea lion is used by the Fire Nation to pull on engine-less and sail-less boats. It appears to be one of the few animals on the show that is not a hybrid of some sort.

Anatomy
The sea lion's skin is maroon-brown, with a tan underside. It has small ears and small eyes, a large nose, and a somewhat portly snout, with short whiskers coming off the sides of its cheeks. It is unknown if the animal has legs or flippers.

Connection
Real-world sea lions are marine mammals. They are distinguished from seals in that they have small ear flaps, whereas seals do not.