Which massive South American wetland system is the primary habitat for *Eunectes notaeus*?
Answer
The Pantanal
The yellow anaconda's current distribution is intrinsically linked to specific hydrological systems in South America, most notably the Pantanal. This massive area, characterized by seasonally flooded grasslands spanning parts of Brazil, Bolivia, and Paraguay, provides the ideal environment for *E. notaeus*. The snake's survival is tied closely to the stability and fluctuations of this wetland system, particularly the tributaries and wetlands associated with the Paraguay River system. The ability to thrive here requires adaptation to both fully aquatic conditions during floods and surviving periods of reduced water availability, possibly through burrowing or seeking refuge in deeper pools.

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