congo eel

an eel-like salamander (Amphiuma means) with two pairs of very small, weak legs, found in the swamps of the SE U.S.
also called congo snake

See congo eel in American Heritage Dictionary 4

noun
An eellike amphibian (Amphiuma means) of the southeast United States, having two pairs of tiny nonfunctioning legs. Although it is almost completely aquatic, it can move overland. Also called Congo snake.
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