The Green Anaconda (Eunectes Murinus) is the world's heaviest snake. It also has the world record for being the world's largest snake. They usually eat medium-sized mammals and medium-sized reptiles, but larger snakes will occasionally eat tapirs, deer, large rodents, caimans, crocodiles, and even Jaguars. There is even proof that female anacondas will eat male anacondas after mating. This could explain why the female doesn't eat before she gives birth. Green Anacondas usually grow to a length of 33 feet long, but there have been reports of Green Anacondas that have grown to lengths of 120 feet, and no, I am not talking about those man-eating anacondas in the movie Anaconda. I'm talking about sightings of anacondas the size of a football field. This could be true, since reptiles grow throughout their lives and the Amazon is so vast, there could really be a really massive snake and we aren't finding it.