The electric eel (Electrophorus electricus) is an electric fish, and the only species in its genus. Despite the name, it is not an eel, but rather a knifefish. The electric eel has three pairs of abdominal organs that produce electricity, the typical output is sufficient to stun or deter virtually any animal. They can vary the intensity of the electric discharge, using lower discharges for hunting and higher intensities for stunning prey or defending themselves. They can also concentrate the discharge by curling up and making contact at two points along its body. When agitated, they can produce these intermittent electric shocks over at least an hour without tiring. Electric eels inhabit fresh waters of the Amazon and Orinoco River basins in South America, in floodplains, swamps, creeks, small rivers, and coastal plains. They often live on muddy bottoms in calm or stagnant waters.
The Tennessee Aquarium in the United States is home to an electric eel that uses its electrical discharges to post from its own Twitter account. Named Miguel Wattson, the eel’s exhibit is wired to a small computer that sends out a prewritten tweet when it emits electricity at a high enough threshold.