The green anaconda (Eunectes murinus) grabs the title of biggest snake in the world. And probably eats it. Patrick K. Campbell/Shutterstock While you may not want to encounter one on a hike ...

These snakes are known for breeding balls, where males compete for a female and cannibalism is common. Their ambush hunting style, ancient giant relatives, and effective camouflage are noted traits.

American conservationist Paul Rosolie allowed himself to be eaten alive by a snake for 2014 documentary film Eaten Alive.