Yellow Anaconda
Reptiles Active day and night

Yellow Anaconda

Eunectes notaeus

The Yellow Anaconda is a stunning, golden titan of the South American wetlands. While smaller than its green cousin, this powerful constrictor is a master of camouflage and an essential apex predator of the Pantanal.

0 Sightings
0 Habitats

Quick Identification

Size

3 to 4.4 metres (9.8 to 14.4 feet) in length; 25 to 55 kilograms (55 to 121 pounds)

Colors

Bright yellow, golden-tan, or greenish-yellow base color covered with overlapping black or dark brown spots and saddle-like blotches

Key Features

  • Golden-yellow base color with irregular black blotches
  • Dark stripes running from the eyes to the back of the head
  • Semi-aquatic build with eyes and nostrils positioned high on the head
  • Heavy-bodied, muscular frame typical of constrictors
Is this a Yellow Anaconda?

Drop a photo or video, or paste from clipboard

When You’ll See Them

Activity pattern Active day and night
Peak hours 6-9 PM, 4-7 AM
Season Year-round (most visible during the dry season, June-September)
Diet A generalist carnivore that preys on wading birds, fish, turtles, small mammals (like capybaras), and even young caimans, using powerful constriction to subdue them.
Habitat Marshes, swamps, slow-moving rivers, and flooded grasslands.

Geographic range

Where Does the Yellow Anaconda Live?

Native to the heart of South America, the Yellow Anaconda thrives in the sprawling wetlands of the Pantanal and the Chaco regions. Its core population spans across Paraguay, southern Brazil, northeastern Argentina, and eastern Bolivia. While strictly endemic to this continent, there have been isolated reports of introduced individuals in the Florida Everglades, though they are far less established than the larger Burmese Python.

Basemap © OpenStreetMap contributors

4 Countries
1.5M km² Range
Least Concern Conservation
PY Paraguay BR Brazil AR Argentina BO Bolivia
iNaturalist / Verified observation data
View on iNaturalist

Explore more Reptiles

Behavior

The Yellow Anaconda is a master of the semi-aquatic lifestyle, spending the vast majority of its time in or near slow-moving water. While they are often perceived as fearsome predators, they are generally shy and prefer to retreat into the water when approached by humans. During the day, they may be found basking on low-hanging branches or riverbanks to regulate their body temperature, but they become highly active hunters under the cover of darkness or twilight.

Socially, these snakes are solitary creatures for most of the year. However, they engage in a unique 'breeding ball' behavior during the mating season, where multiple males cluster around a single large female for several weeks. Despite their massive size, they are remarkably stealthy, using their camouflage to blend into the murky depths and vegetation of their wetland homes.

EverydayEarth exclusive

Camera Tips

To capture the Yellow Anaconda on camera, focus your efforts on the 'transition zones' between water and land. Look for flattened vegetation or 'slides' on muddy banks where these heavy snakes enter and exit the water. Position your camera very low to the ground—no more than 12 to 18 inches high—and angle it parallel to the shoreline. Because these snakes are cold-blooded, traditional Passive Infrared (PIR) sensors may struggle to trigger based on heat signatures alone. Using a 'Time-Lapse' mode at 1 to 5-minute intervals during the golden hours of dawn and dusk is often more effective than relying on motion detection.

Placement is everything. Look for sunny logs or patches of dry ground near the water's edge, as anacondas frequently use these spots for basking in the morning sun to aid digestion. In backyard settings bordering wetlands, avoid using traditional baits; instead, ensure there is plenty of natural cover like tall grass or fallen logs. If you are in a legal area where attractants are permitted, the scent of fish oil near the camera can sometimes pique their curiosity, though they are primarily visual and vibration-sensitive hunters.

For the best results, use a camera with high-resolution night vision and a fast trigger speed. During the wet season, anacondas disperse widely through flooded forests, making them harder to find. Your best bet is during the dry season when water sources shrink, forcing the snakes into more predictable, concentrated areas. Ensure your camera housing is fully waterproof and secured against rising water levels, as flooding can occur rapidly in their preferred habitats.

Frequently Asked Questions

Yellow Anacondas are cathemeral, meaning they are active during both day and night. However, they typically bask in the sun during the morning and mid-day to regulate their temperature and become more active hunters during the crepuscular hours of dawn and dusk.
If your property borders a South American wetland, you can attract them by maintaining natural marshy vegetation and providing 'basking structures' like large, flat logs near the water. They are attracted to areas with high prey density, such as spots frequented by water birds or small mammals.
They are opportunistic carnivores with a varied diet including fish, amphibians, turtles, wading birds, and mammals like capybaras. They are even known to occasionally prey on small caimans.
They are rarely found in true suburban areas unless the neighborhood is built directly into or adjacent to their native wetland habitats in countries like Paraguay or Brazil.
The Yellow Anaconda is smaller and has a distinct yellowish-gold base color. The Green Anaconda is much larger, has an olive-drab or dark green base color, and features orange or red stripes on the sides of its head.

Record Yellow Anaconda at your habitat

Connect a camera to start building your own species record — AI identifies every visitor automatically.

Join free Identify a photo