Boa Constrictor Imperator (BCI)

Boa constrictor imperator
Morph/Lineage: Sunset “Extreme”

Species Overview

• Size: Boa constrictor imperator typically reach 6–8 feet (1.8–2.4 m), with females generally larger than males. Adults usually weigh 15–30 pounds depending on husbandry.

• Appearance: The Sunset line is a polygenic, line-bred trait selectively developed to enhance orange and red pigmentation throughout the body and tail. The “Extreme” variation refers to individuals with particularly intense colour expression, often producing bold orange saturation and reduced dark contrast. Patterns can vary but are generally cleaner than wild-type boas, with rich undertones that intensify as the snake matures.

• Distribution: The natural Boa constrictor imperator ranges from Mexico through Central America into Colombia.

• Habitat: Wild BCIs inhabit tropical forests, scrublands, savannahs, and riversides, adapting to a wide range of ecosystems.

• Behaviour: Nocturnal ambush predators feeding on small mammals, birds, and reptiles. Juveniles often climb, while adults are primarily terrestrial.

Captive Care

• Enclosure: A naturalistic enclosure is recommended. Adults thrive in at least a 6′ × 2′ × 2′ setup with secure hides, cork bark, climbing branches, and foliage. Bioactive setups with soil substrate, live plants, and leaf litter help regulate humidity and provide enrichment.

• Temperature & Humidity: Maintain a gradient of 80–85°F (27–29°C), with a basking spot of 88–92°F (31–33°C). Nighttime drops to 75–78°F (24–26°C) are acceptable. Humidity should remain 55–70%, with a large water dish available for soaking.

• Diet: Juveniles feed every 7–10 days on small rodents; adults every 14–21 days.

• Behaviour in Captivity: Sunset boas are hardy and usually adapt well to captive life. They may display strong feeding responses but typically tolerate handling once established.

• Special Considerations: While selective breeding has produced a wide variety of morphs, their core care requirements remain identical to standard Boa constrictor imperator.

Polygenic/Line-Bred Note

The Sunset is a polygenic, line-bred trait selected for its red and orange colouration. The “Extreme” designation is not a separate genetic mutation but rather refers to individuals showing particularly intense expression of these traits. As with all polygenic boas, variation exists between individuals, and selective breeding enhances colour saturation over generations.