
Beastfile · Reptiles
Green Anaconda
Eunectes murinus
Also known as Water Boa
The heaviest snake alive, and almost helpless out of water.
Overview
The green anaconda is the heaviest snake in the world. Reticulated pythons grow longer, but an anaconda is built thicker and can pass 100 kilograms. It is a water animal: eyes and nostrils sit on top of the head so it can lie submerged with almost nothing showing, and its bulk that seems ungainly on land becomes easy movement once it is floating. It kills by constriction, tightening with each exhalation of its prey until circulation fails. Females are substantially larger than males, which is the reverse of most snakes.

Origin
Tropical South America east of the Andes, especially the Amazon and Orinoco basins and the seasonally flooded grasslands of the Llanos and Pantanal.
Habitat
WetlandsNotable Traits
- •The heaviest snake in the world, though not the longest
- •Eyes and nostrils on top of the head for lying submerged
- •Kills by constriction, tightening as prey exhales
- •Females are far larger than males
- •Gives birth to live young rather than laying eggs
Conservation
Not assessed as globally threatened, but the species is hunted for its skin and killed out of fear, and it depends on wetland systems that are being drained and converted.