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Anaconda: Characteristics, Diet, Facts & More [Fact Sheet]

Welcome to the fascinating world of the Anaconda – a name that sends shivers down the spine, evoking images of monstrous, coiling serpents hiding in the depths of the Amazon rainforest.

The Anaconda, primarily the Green Anaconda, is the heaviest and one of the longest-known snake species globally. This creature’s life, behavior, and habits are intriguing, providing a rich study source for herpetologists.

This article aims to enlighten you about this awe-inspiring giant of the snake world, from its detailed physical characteristics to its lifestyle and conservation status.

The Anaconda at a Glance


Class:Reptilia (Reptiles)
Species:E. murinus (Green Anaconda), E. notaeus (Yellow Anaconda), E. deschauenseei (Dark-spotted Anaconda), E. beniensis (Bolivian Anaconda)

Essential Information

Average Size:Up to 17 feet for males, and females can exceed 20 feet; some unverified records claim individuals measuring up to 30 feet.
Average Weight:30-70 lbs for males, 200 lbs for females, with large females capable of reaching over 550 lbs.
Average Lifespan:10 years in the wild, up to 30 years in captivity.
Geographical Range:Amazon and Orinoco basins in South America, from Colombia and Venezuela to the east of the Andes, down to northern Bolivia and central Brazil.
Conservation Status:Not evaluated by the IUCN, but populations are believed to be stable.

Species and Subspecies

Under the common name ‘Anaconda’, four species are recognized:

  • Eunectes murinus (Green Anaconda): The most well-known and largest species, these snakes are primarily dark green in color with black oval patches on the back.
  • Eunectes notaeus (Yellow Anaconda): Smaller than their green counterparts, Yellow Anacondas have a beautiful yellow, golden-tan or greenish-yellow color with dark spots and blotches.
  • Eunectes deschauenseei (Dark-spotted Anaconda): Smallest of the four species, these anacondas have a dark brown to reddish color with large, rounded black spots on the lower sides.
  • Eunectes beniensis (Bolivian Anaconda): A relatively newly recognized species, they are similar in coloration to the Green Anaconda but have unique scalation.
Anaconda in water


Anacondas are known for their massive size. Females significantly outsize males, exhibiting strong sexual dimorphism. A large female can grow over 20 feet long and weigh over 550 lbs, while males usually max out at about 17 feet and 70 lbs. These measurements, however, vary among the four species, with the Green Anaconda being the largest.

These snakes are equipped with a broad, flat head distinct from the neck, small, smooth scales, and eyes and nostrils positioned on the top of the head – perfect adaptations for a life spent mostly in water.

They have a complex color pattern with a base color ranging from olive green to yellow and overlaid with black or dark brown blotches, allowing them to blend effectively with their surroundings.

Also read: Anaconda Teeth: Do Anacondas Have Fangs?

Habitat and Distribution

Anacondas are primarily aquatic snakes found in South America’s tropical rainforests, swamps, and marshes. They inhabit the Amazon and Orinoco basins and are well distributed from the east of Andes, Colombia, and Venezuela to northern Bolivia and central Brazil.

Their preferred habitats are slow-moving rivers and streams, flooded forests during the rainy season, and river banks. Anacondas are excellent swimmers and can stay submerged for a considerable time, barely showing their nostrils above the water’s surface for breathing. They are occasionally found in grasslands but always close to bodies of water.

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Anaconda head


Anacondas are semi-aquatic and mostly nocturnal creatures, using the dark to help cover their enormous bodies while they hunt. They are generally solitary creatures, coming together primarily during the mating season.

They don’t have vocal cords or a means of producing any vocal sound, but they can hiss loudly when threatened, as well as use body language, such as coiling or inflating their bodies, to communicate.

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Diet and Hunting/Feeding Behavior

Anacondas are carnivorous predators and have a broad diet that includes fish, birds, small mammals, and sometimes even larger prey like deer, capybaras, and caimans. They are ambush predators who rely on their camouflage and patience, often waiting for hours or days until unsuspecting prey comes within striking range.

Once the prey is within reach, the anaconda will strike swiftly, seizing the prey with its jaws and immediately wrapping its coils around it, constricting it until the prey succumbs to suffocation. Despite their massive size, anacondas can go weeks or even months without food after a big meal.

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Young anacondas face threats from a variety of predators, including larger anacondas, caimans, large birds of prey, and wild cats. However, once an anaconda reaches its full size, it has few natural predators, with humans being the biggest threat.

Hunting for their skins and the exotic pet trade have significantly affected their population. Habitat destruction and fragmentation is another major concern for their conservation.

Also read: Anaconda vs. Jaguar: Who Eats Who?

Anaconda in a swamp

Reproduction and Life Cycle

Anacondas are ovoviviparous, which means they give birth to live young. The breeding season usually occurs during the rainy season, when food is most abundant. Males find potential mates by following the female’s pheromone trails.

When a female is ready to mate, she may attract several males, leading to a unique mating ball situation where multiple males coil around a single female, all competing to mate with her.

The gestation period for anacondas is approximately six months. After this period, the female gives birth to around 20 to 40 live young, although some reports have noted as many as 100 in a single litter.

The newborns are independent at birth and receive no further care from their mother. They grow rapidly in their first few years and can reach sexual maturity in 3 to 4 years.

Also read: Do Anacondas Lay Eggs? Understanding Anaconda Reproduction

Conservation and Threats

The anaconda is not currently listed as endangered, but it is protected in many parts of its range due to the threats it faces. It is difficult to accurately determine their population due to their elusive nature and inaccessible habitats.

The main threats to the anaconda include hunting for their skin, capture for the pet trade, and habitat destruction caused by agriculture and development.

Some conservation efforts include legal protection from hunting in many areas and the inclusion of their habitats in protected areas. Public education and awareness campaigns also play an important role in reducing the demand for anacondas as pets or for their skin.

Fun Facts

  1. Record Holders: The green anaconda is the heaviest snake in the world and one of the longest. Some individuals have been reported to reach lengths of over 29 feet (8.8 meters)!
  2. Aquatic Abilities: Anacondas are excellent swimmers and can stay submerged for up to ten minutes before needing to surface for air.
  3. Mating Marathon: The “mating ball” formed during the breeding season can last for up to a month with the males refusing to eat during this period.
  4. Growing Giants: Baby anacondas are born at a length of around 2 feet (0.6 meters). Considering they can grow to over 29 feet, that’s quite an impressive growth spurt!
  5. Solitary Snakes: Aside from their unique mating gatherings, anacondas live solitary lives, preferring to hunt and live alone.

Also read: 25 Super Interesting Facts About Anacondas

Frequently Asked Questions

How big can anacondas get?

Green anacondas can reach lengths of over 29 feet (8.8 meters) and weights of up to 550 lbs (250 kg). However, the average size is closer to 16 feet (4.9 meters).

What do anacondas eat?

Anacondas are carnivores with a diet that includes a variety of prey such as fish, birds, mammals, and other reptiles.

Are anacondas venomous?

No, anacondas are not venomous. They are constrictors, which means they squeeze their prey to death.

How long can anacondas live?

In the wild, anacondas can live up to 10 years. However, in captivity, they have been known to live for up to 30 years.

Where are anacondas found?

Anacondas are found in South America, living in swamps, marshes, and slow-moving streams of the Amazon and Orinoco basins.

Are anacondas endangered?

While they are not currently listed as endangered, anacondas face threats from hunting and habitat destruction. Their conservation status can vary depending on the region and specific species.

What predators do anacondas have?

Anacondas are apex predators, meaning they have no natural predators when they reach adulthood. However, younger, smaller anacondas may fall prey to larger predators like caimans, large birds of prey, and even other anacondas.

Anacondas Compared

Learn more about how anacondas can be compared with other animals:

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