#401 Electric Eels

Electric eels are born to shock. Thanks to cells called electrocytes which, stacked like batteries, make up 80% of their bodies, these cunning South American ___ can deliver debilitating blows of up to 600 volts to their prey. But they’ve harnessed their electricity to pack even bigger punches. Last year, Vanderbilt University biologist Kenneth Catania revealed electric eels bring their positively charged head and negatively charged ___ closer together to generate a more powerful ___ .