Electric Eels are on 2 different episodes, and are #5 on Predators, and #1 on Weird Weapons. They have a tail packed with up to 200,000 linked electrochemical cells. They combine to pack a punch five times worse than sticking your finger in a power socket, which is more than enough to stun a caiman. They use electricity for much more than just defense, it's an extreme way of hunting. They can knock down a horse, and repeated shocks could kill a human. By generating low pulses, they can navigate and locate small fish. It's only the high voltages that are lethal.
- If following the countdown of extreme Predators, here is a link to the next contender, which is another fish which can turn a pleasant swim at the beach into a nightmare.