Anaconda

 

Anacondas are large, non-venomous boas found in tropical South America. Although the name actually applies to a group of snakes, it is often used to refer only to one species in particular, the green anaconda, Eunectes murinus, which is one of the largest snakes in the world, and  arguably the longest. Specimens of up to around 30 feet have been caught or killed and examined.

They live mostly in water, such as the Amazon River.

Eunectes is their genus.