Eunectes Murinus

Eunectes murinus (derived from the Greek Ευνήκτης meaning "good swimmer" and the Latin murinus, "of mice" for supposedly preying on mice, not for being "gray mouse-colored") is a nonvenomous boa species found in South America. It is the heaviest known 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.