Turtle duck

Turtle ducks live in ponds throughout the world, but they especially love the warm weather of the Fire Nation. They are both great fliers (although no wings can be seen) and great swimmers. These animals are especially cute when young, but they are attentively protected by their mothers.

History
Zuko was shown feeding them multiple times, first during a flashback when he was still a child and later when he had returned to the Fire Nation, right before he was interrupted by Azula. They were seen to be much more welcoming towards Zuko than Azula, whom they were terrified of due to her aggression.

Anatomy
A turtle duck has the head, neck, webbed feet and tail of a duck, but the body and shell of a turtle. Its neck, tail and most of its head are light brown or beige in color. A dark brown stripe runs from its beak back over its head. Its shell is dark green and its scaly underside is light green or off white.

Connection
As the name implies, this animal is a cross between a duck and a turtle. Duck is an umbrella term for the common water fowl, which includes geese and swans. Turtles are ancient reptiles that have been around since the Triassic period, and there are two to three hundred species of turtles in existence today.