Eunectes murinus, commonly known as the green anaconda, is a non-venomous boa species found in South America. It is the largest, heaviest, and second longest (behind the reticulated python) known extant snake species. The term anaconda (without further qualification) often refers to this species, though the term could also apply to other members of the genus Eunectes. Other common names include common anaconda and water boa. The green anaconda is the world's heaviest and one of the world's longest snakes, reaching more than 6.6 m long. The picture shows a juvenile specimen in moult.
From album: National Parks and examples of Linking Tourism & Conservation of Ecuador