The Green Anaconda (Eunectes murinus), also known as common anaconda, common water boa, or sucuri, is a non-venomous boa species found in South America. It is the heaviest (weighing up to 500 lbs.) and one of the longest known extant snake species. They also are the third longest snake in the world after the amethystine and reticulated python, with a length of up to 23 ft. The term "anaconda" often refers to this species, though the term could also apply to other members of the genus Eunectes.
The green anaconda is the largest and most deadly of anacondas in South America, able to hunt prey as big as cows. They'll also eat fish, birds, frogs, sloths, deer, capybaras, and even caimans. They have backward-facing teeth to latch onto their prey. They can ambush their prey from the water, but since they're amphibious, they also can hunt on land, and sometimes even in the trees. Their incredibly muscular bodies allow them to coil around their prey and constrict them to death. They have to swallow their prey whole, and can even unhinged their bottom jaw to fit large prey down.