FaunaHub

Anaconda

ReptileSnakeWild

A green anaconda (Eunectes murinus), a heavy-bodied snake, partly in water.

Green anaconda (Eunectes murinus).

Image: TimVickers, Public domain, via Wikimedia Commons.

Overview

Anacondas are large, heavy-bodied, semi-aquatic snakes of South America. This page is a group-level overview; the green anaconda (Eunectes murinus) is used as a reference — one of the largest and heaviest snakes in the world, alongside the longer but more slender reticulated python. Anacondas are non-venomous constrictors that spend much of their lives in or near water.

Habitat & Range

Green anacondas live in the swamps, marshes, and slow rivers of tropical South America, especially the Amazon and Orinoco basins. Their bulky bodies are well suited to water, which supports their weight and aids ambush hunting; they are far less agile on land. Other anaconda species occupy related wetland habitats. Range varies by species.

Diet

Anacondas are carnivorous constrictors that ambush prey at the water's edge, seizing and coiling around animals such as fish, birds, reptiles, and mammals, with larger individuals taking larger prey. They are non-venomous, subduing prey by constriction. This page describes general feeding ecology and avoids exaggerated or sensational claims.

Behavior

Anacondas are mostly solitary and often lie submerged with only the eyes and nostrils, set high on the head, above the surface. They are ambush predators, relying on stealth rather than speed. Females are typically much larger than males and give birth to live young. Reports of their size and behaviour are often exaggerated in popular culture; this page keeps to a cautious, educational account.

Human Interaction & Conservation

Anacondas are wild snakes, not pets; their size and needs make private keeping inappropriate and often regulated. They feature heavily in films and folklore, frequently with exaggerated danger, but they are best understood as ambush predators of remote wetlands. The green anaconda is generally not considered globally threatened, though it faces habitat and persecution pressures; conservation status should be checked against current sources. This page is educational, not care or handling advice.

Appearance & Recognition

The green anaconda is a thick-bodied olive-green snake patterned with dark oval blotches, with eyes and nostrils positioned high on the head for lurking at the surface. It is renowned for its great mass rather than extreme length. Other anacondas are smaller. The heavy build, aquatic habits, and blotched pattern help identify anacondas among large snakes.

Similar Animals

Anacondas are boas, related to other constrictor snakes, and share the suborder Serpentes with the snake profile covered separately on FaunaHub. They are often compared with the reticulated python, which is longer but more slender; the anaconda is the heavier of the two.

Snakes — the wider group →

More photos of the anaconda

A juvenile green anaconda coiled, showing its patterned skin.

A juvenile green anaconda.

Image: Bernard DUPONT, CC BY-SA 2.0, via Wikimedia Commons.

Frequently Asked Questions — Anaconda

Are anacondas the biggest snakes in the world?
The green anaconda is among the largest snakes by mass — one of the heaviest in the world — while the reticulated python is generally longer. "Biggest" depends on whether you mean length or weight. Reports of record sizes are often exaggerated.
Are anacondas venomous?
No. Anacondas are non-venomous constrictors. They subdue prey by gripping and coiling around it rather than by venom. This page describes that ecologically and does not provide handling or safety instructions.
Can anacondas be kept as pets?
Anacondas are large wild snakes with demanding needs, and private keeping is inappropriate and often regulated. This page is an educational wildlife profile, not a care or ownership guide.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.