Two new electric eel species have been identified in the Amazon basin, including one fish with a record-breaking shock, scientists say.

Researchers had previously identified only one species of electric eel in more than 250 years of studying the creatures that lurk in South American waters and stun their prey with electric discharges.

However, the new genetic and ecological analysis, published Tuesday in the peer-reviewed Nature Communications, identifies a total of three unique electric eel species that descended from one common ancestor millions of years ago.

The research was done by a team of scientists from Brazilian and American universities as well as Smithsonian’s National Museum of Natural History, and it sheds light on how little experts really know about the diversity of species in the Amazon rainforest, said study author C.

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