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A specialised electric organ exists in each animal's body, which is made up of thousands of cells called electrocytes that are aligned like batteries.

Angel Caputi, a computational neuroscientist at the Institute for Biological Research in Uruguay, has written that the electrocytes line up “like a series of batteries piled into a flashlight.”

Electric eels use metabolic energy to sustain differences in electrolyte concentration between electrocytes.

Instead, thousands of cells called electrocytes are arranged along its body, each producing a small ion gradient and therefore a potential difference across them.

Electric eels have thousands of special cells, called electrocytes, that can store energy like a battery and then discharge it.