Eunectes notaeus, commonly known as the Yellow Anaconda, is found in South American wetlands, swamps, and marshes. It is notable for its yellow-green skin with black blotches, semi-aquatic lifestyle, and non-venomous constricting behavior. Females are typically larger than males, reaching up to 4.6 meters in length.

The yellow anaconda (Eunectes notaeus) is native to South America, specifically found in the countries of Argentina, Bolivia, Brazil, Paraguay, and Uruguay. Its distribution is primarily concentrated in the southern part of the continent.

The yellow anaconda inhabits a variety of wetland environments, including swamps, marshes, and slow-moving rivers. It thrives in regions with abundant water sources and dense vegetation, which provide both shelter and hunting grounds. The climate of these areas is typically warm and humid, with seasonal flooding that influences the availability of prey and habitat structure.

As a semi-aquatic species, the yellow anaconda is well-adapted to life in water, often seen basking in shallow waters or resting in dense vegetation near water bodies. Its ecological niche involves preying on a variety of animals, including fish, birds, and small mammals. The species is an apex predator within its habitat, playing a crucial role in maintaining the balance of its ecosystem.