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Yellow anacondas are solitary animals, except in breeding season. ( Simon, 1992) Communication and Perception Yellow anacondas do not seem to defend territories. No information is available on home range size. They are considered timid snakes and normally try to escape from predators, such as humans, but they will defend themselves when threatened. In times of drought yellow anacondas actively seek swamps and marshes with enough water in which to hunt. Most of their time is spent in aquatic habitats, hunting prey, although they venture onto land for mating, moving to other water bodies, or hunting occasional terrestrial prey.
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Yellow anacondas may spend up to several months in courtship and mating, but separate once mating is complete. Yellow anacondas are strictly solitary, found only with other yellow anacondas for mating. Humans greatly influence the lifespan of yellow anacondas in the wild, as poaching has decreased the number of yellow anacondas to a dangerously unstable level. In captivity yellow anacondas can live up to 23 years. The typical lifespan for yellow anacondas in the wild is from 15 to 20 years.
Once they reach adult sizes, yellow anacondas have few natural predators. Most mortality in yellow anacondas occurs as young, when they are smaller and vulnerable to predation.
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Yellow anacondas can be found in swamps and marshlands with slow-moving rivers or streams. Yellow anacondas occur in southern South America, including Paraguay, southern Brazil, northeastern Argentina, and Bolivia.