Two-headed fish

A Two-Headed Fish appears when Team Avatar buys food in Jang Hui. Sokka was sold one in the Fire Nation village of Jang Hui. The pollution of the Jang Hui River has caused the fish to mutate into having two heads. It was used to make soup. Sokka stated he purchased this deformed fish because, "You get more for your money that way." It is implied that not just one species of fish is mutated.

The pollution was caused by the neighboring Fire Nation smeltering factory which dumped its sludge refuse into the river, resulting in vast ecological damage to the surrounding area including to the fish, the wildlife and the village inhabitants themselves.

Trivia
Polycephaly, which is a condition of having more than one head and is derived from the stems poly- meaning "many", and kephal- meaning "head" This encompasses bicephaly and dicephaly (both referring to two-headedness). Each head of a polycephalic animal has its own brain and share control of the organs and limbs, though the specific structure of the connections varies. Animals often move in a disoriented and dizzy fashion, with the brains "arguing" with each other; some animals simply zig-zag without getting anywhere,a severe example of this behavior is a two headed snake that may attack and even attempt to swallow each others head. Polycephalic animals survive poorly in the wild compared to monocephalic animals.

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