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Despite their name, electric eels are not closely related to the true eels ([[Anguilliformes]]) but are members of the [[Electroreception|electroreceptive]] knifefish [[Order (biology)|order]], [[Gymnotiformes]]. This order is more closely related to [[catfish]]. In 2019, electric eels were split into three species: for more than two centuries before that, the genus was believed to be [[Monotypic taxon|monotypic]], containing only ''[[Electrophorus electricus]].''
They are nocturnal, obligate air-breathing animals, with poor vision complemented by electrolocation; they mainly eat fish. Electric eels grow for as long as they live, adding more vertebrae to their spinal column.
== Evolution ==
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