Anacondas are large non venomous constricting snakes found in South America. There are currently 4 recognized species of anaconda. The Green Anaconda is the heaviest snake in the world.
The other 3 species of Anaconda include the Yellow Anaconda, Bolivian Anaconda and the Dark Spotted Anaconda. The Yellow Anaconda and the Green Anaconda are the most common, with the Yellow being smaller in size. They grow to an average length of about 10-12ft.