Green anacondas are found in northern South America in areas surrounding the Amazon River Basin. In the rainforests of the Amazon, they are often located near sources of water such as swamps, marshes, streams, rivers and lakes.

Green anacondas feed on a variety of animals such as rodents, birds, fish, turtles and caiman. Capybaras, who escape from predators such as jaguars by running into the water, are perfect meals for anacondas. If an anaconda is large enough, it may attack larger mammals, including deer. There have even been several reports of green anacondas attacking humans, but few of these reports are substantiated.

Green anacondas are the largest (by weight) snakes in the world. They are also among the longest snakes in the world. Only reticulated pythons, located in southeast Asia, can be larger in length. Green anacondas often grow between 20 - 25 feet. They can weigh as much as 400 - 500 pounds.

Green anacondas are, as their name suggests, green. They have black spots across their entire bodies that are unsymmetrical, forming perfect camoflage for the thick, dense forests that they live in. Spots on the sides of their bodies often have yellow centers. Like all reptiles, green anacondas have scaly skin. Their skin is dry and somewhat thick. Green anacondas are very strong and muscular, and must be in order to attack and kill large prey.

Green anacondas are not venomous, and do not kill their prey with bites alone. Rather, they will bite their prey and then wrap their massive bodies around the prey. As their prey is exhaling, green anacondas will squeeze their bodies tighter around their prey eventually causing suffocation. This process is called constriction. After this constriction process, green anacondas will begin to swallow their prey whole. Their jaws are held together by stretchy ligaments, allowing their mouths to open to sizes much larger than the initial size of their heads. Green anacondas have very slow-acting digestive systems. After swallowing their prey, it may take several weeks for anacondas to completely digest their meals.

Green anacondas are very well adapted to living in the tropical rainforests of the Amazon River Basin. Since they are cold-blooded, year-round warm-temperatures help to keep their blood warm.

Although they are slow and cumbersome on land, green anacondas are fast and agile in the streams and rivers of the Amazon. Their eyes and nostrils are positioned on the tops of their heads, so that they can submerge most of their bodies while laying in wait for prey near the water's edge.

Anacondas are ovoviviparous, which means that the eggs hatch while still inside the mother. The mother will then give birth to live young. Green anacondas can give birth to over 20 live young at a time

In 1997, the movie "Anaconda" was made. The film features a giant green anaconda that is being hunted by a snake hunter and a film crew.