B.C.I (IMG DH VPI Snow)

B.C.I (IMG DH VPI Snow)

Scientific Name: Boa constrictor imperator
Common Name: Boa constrictor, Columbian boa

Species Overview

Size: Adults typically reach 6–8 feet (1.8–2.4 m) in length, with females generally larger and heavier-bodied than males. Adult weight commonly ranges from 15–30 pounds, depending on sex, genetics, and husbandry.

Appearance: This Boa constrictor imperator exhibits the progressive darkening associated with the IMG trait, which intensifies with age and adds dramatic contrast to the overall pattern. The animal carries additional recessive genetics associated with Snow and T+ Albino (VPI type) traits, though these traits are not visually expressed.

Distribution: Native to Central America and northern regions of South America.

Habitat: Occupies tropical forests, forest edges, scrublands, agricultural margins, and areas near rivers or wetlands.

Behaviour: A nocturnal ambush predator that relies on camouflage and patience. Juveniles may utilise low climbing opportunities, while adults are primarily terrestrial and spend daylight hours concealed.

Captive Care

Enclosure: A naturalistic enclosure is strongly recommended. Adults should be housed in a minimum enclosure size of 6′ × 2′ × 2′ (183 × 61 × 61 cm). Provide multiple hides, sturdy branches, cork bark, and visual barriers. Soil-based or mulch substrates assist with humidity retention and enrichment.

Temperature and Humidity: Maintain an ambient temperature range of 80–85°F (27–29°C), with a basking area of 88–92°F (31–33°C). Nighttime temperatures may drop to 75–78°F (24–26°C). Humidity should remain between 55–70%, supported by a large water dish and occasional misting.

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

Diet: Juveniles should be fed appropriately sized rodents every 7–10 days. Adults typically feed every 14–21 days, adjusted based on prey size and body condition.

Behaviour in Captivity: Generally hardy and adaptable. Most individuals acclimate well to captivity and tolerate routine handling, though feeding responses can be strong.

Special Considerations: Due to their potential adult size and strength, long-term housing plans should be considered early. Larger individuals may benefit from assisted handling, and having a second set of hands is recommended for safety and control.

Taxonomy Note

Boa constrictor imperator is a member of the family Boidae, a group of non-venomous constricting snakes native to the Americas. Formerly classified as a subspecies of Boa constrictor, B. imperator is now widely recognised as a distinct species based on genetic, morphological, and geographic evidence, with a natural range spanning much of Central America and extending into parts of northern South America. In captivity, this species is valued for its adaptability, generally steady temperament, and extensive diversity of selectively bred colour and pattern traits, all of which retain consistent core behaviours and care requirements across standard B.C.I forms.

Genetics Note

IMG (Increasing Melanism Gene) (Dominant): The IMG gene will create a snake that becomes darker and darker with age until the animal is almost completely black. Only one copy of the gene is needed to produce animals that display the trait.

VPI Snow (Double Heterozygous - 100%): This animal has genetics to produce VPI Snow offspring when paired with another double het VPI Snow boa, stunning snakes that show reduced, crisp patterning and lavender and cream colouration.