The ELECTRIC EEL inhabit in fresh waters of the Amazon and Orinoco river basin in South America.They live in muddy, dark waters, and have poor eyesight. So instead of using eyes, electric eels emit a weak electric signal, which they use like radar to navigate, to find a mate, and to find prey. Once prey is found, electric eels will use a much stronger shock to stun prey, usually smaller fish.

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https://www.bbfishcountry.com/2019/01/the-electric-eel.html