In the latter stages of the Hundred Year War, a Fire Nation Army factory near Jang Hui began polluting the surrounding river with its sludge waste. This resulted in vast ecological damage to the surrounding area, including the clams.
Taken from the bottom of the filthy river bed, the clam is filled with a multitude of disgusting substances including dirt, seaweed, and dead bugs. It is a bivalved mollusk that is somewhat brown in color and has what appear to be blisters on its shells.
The clam is a mollusk, an invertebrate animal whose body is protected by two symmetrical shells. It has no brain or eyes, but has a set of kidneys, a heart, a mouth, and an anus. It feeds on plankton, and its natural predators are small sharks and squid.