The Argentine Boa (Boa constrictor occidentalis), also known as the Argentine Boa Constrictor or South American Boa, is a distinctive subspecies renowned for its striking appearance and unique adaptations to its native environment. Found primarily in the dry forests, savannas, and scrublands of Argentina and parts of Paraguay, this boa is characterized by its robust build and a relatively heavy body. One of its most notable features is its coloration, which typically includes a background of dark browns, blacks, and grays, often adorned with bold, contrasting saddle patterns along its back. This coloration not only provides excellent camouflage in its arid and semi-arid habitats but also makes the Argentine Boa one of the most visually striking members of the Boa constrictor species complex. Their scales are iridescent under certain lighting conditions, creating a rainbow-like effect that adds to their allure for reptile enthusiasts. These boas can reach lengths of 7 to 10 feet, with females generally being larger than males, and are known for their relatively calm temperament compared to some other boa subspecies.

Despite their beauty and relatively placid nature, Argentine Boas face significant conservation challenges. They are currently listed as "Near Threatened" on the IUCN Red List due to habitat loss, fragmentation, and poaching for the exotic pet trade and their skins, which are highly prized for leather goods. The clearing of native forests for agriculture and urban development has reduced their natural habitat, making them increasingly vulnerable in the wild. Additionally, local populations may also be impacted by human-wildlife conflict, as boas are sometimes killed out of fear or to protect livestock. Conservation efforts are essential to protect these unique snakes, including habitat preservation and stricter regulation of the pet trade. Moreover, their ability to adapt to various environmental conditions has shown promise in captivity, where they are bred by enthusiasts who appreciate their unique appearance and generally manageable size, but their long lifespan and specific care requirements mean they are best suited for more experienced keepers.