Turtle seal

Turtle seals are social animals that live in herds. These loud but lovable creatures are native to the icy North Pole. They especially enjoy swimming through the ice tunnels underneath the Northern Water Tribe. Their hard shells provide them with some protection from their natural enemy, the polar leopard. Turtle seals are carnivorous, eating fish, shellfish, squid and other ocean creatures.

History
These creatures unwittingly showed Zuko how he could enter the city of the Northern Water Tribe undetected. One turtle seal followed Aang in Ba Sing Se, who was leading it to its new home in the renewed Ba Sing Se Zoo.

Anatomy
The turtle seal is green with a hard shell around its midsection and four flippers that allow it to swim well in cold water. The creature has a long, sleek neck and head, and its face is characterized by small black eyes, ears and whiskers. Unlike the turtle duck, whose legs make it appear like a tortoise, the turtle seal's flippers are its prominent form of transportation.

Connection
The turtle seal is simply a seal with a turtle's shell, meaning it is connected to the seal and the turtle.