The yellow anaconda (scientific name Eunectes notaeus, also known as the Paraguayan anaconda) is a boa species endemic to South America. It is one of the largest snakes in the world, but is not as large as its close relative, the green anaconda. Like all boas and pythons, it is non-venomous and kills its prey by constriction. The yellow anaconda is found in southern regions of South America, including Paraguay, southern Brazil, northeastern Argentina, and Bolivia. No subspecies are currently recognized.