Bolivian Boa (Classic/Patternless)

Bolivian Boa (Classic/Patternless)

Scientific Name: Boa constrictor amarali
Common Name: Bolivian Boa

Species Overview

Size: Adults typically reach 5–7 feet (1.5–2.1 m) in length, with females slightly larger and more robust than males. Adult weight ranges from 15–25 pounds, reflecting a more compact, muscular build compared to other Boa constrictor subspecies.

Appearance: This subspecies exhibits darker, earthier tones than northern boas, often with rich browns, deep reds, and black saddles. Side markings are muted, giving the Bolivian Boa a more uniform, subtle appearance. Body is muscular and stocky, with a slightly shorter and thicker profile than B.C.I.

Distribution: Native to central Bolivia, typically found near forests, scrublands, and rivers.

Habitat: Inhabits tropical and subtropical forests, semi-arid regions, and riverine environments. Bolivian Boas tolerate slightly lower humidity than northern Boa constrictor populations, adapting to seasonal variations.

Behaviour: Primarily nocturnal ambush predators. Juveniles may climb low vegetation, while adults are mainly terrestrial. Generally calm but strong and muscular.

Captive Care

Enclosure: A naturalistic setup is recommended. Adults should have at least a 4′ × 2′ × 2′ (122 × 61 × 61 cm) enclosure for smaller adults, though larger individuals benefit from 5–6′ × 2′ × 2′ setups. Include multiple hides, sturdy branches, water dish, and visual barriers. Soil-based or mulch substrates support humidity and natural behaviour.

Temperature and Humidity: Maintain ambient temperatures of 78–82°F (26–28°C), with a basking spot of 88–90°F (31–32°C). Nighttime temperatures can drop to 72–76°F (22–24°C). Humidity should remain between 55–70%, with a water dish for soaking.

Lighting: Standard ambient lighting on a consistent day–night cycle is sufficient. Low-output UVB is optional for planted or bioactive setups.

Diet: Juveniles should be fed appropriately sized rodents every 7–10 days; adults every 14–21 days.

Behaviour in Captivity: Generally hardy and adaptable, with a calm temperament. Adults are strong, so assisted handling is recommended for safety and control.

Special Considerations: Compact but muscular body requires careful handling, especially for larger adults. Enclosures should be planned with long-term size in mind.

Taxonomy Note

Boa constrictor amarali, commonly known as the Bolivian Boa, is a distinct subspecies of Boa constrictor native to central Bolivia. It is recognised for its more compact, muscular body, darker earthy coloration, and subdued side markings compared to northern B. constrictor populations. In the wild, it occupies forests, scrublands, and riverine habitats, showing adaptability to both humid and semi-arid conditions. In captivity, Bolivian Boas retain the characteristic calm temperament and ambush predation behaviour of Boa constrictor, making them manageable with consistent husbandry.

Genetics Note

Classic / Patternless (Line-Bred / Polygenic Trait): These snakes are primarily wild type in appearance, with normal black, brown, and cream saddle patterns, but may show slight reduction in pattern due to influence from Patternless parents. This trait is achieved through selective breeding and is not a formally documented single-gene recessive. Offspring may vary in pattern depending on parental genetics.