Scientific Name: Gonyosoma jansenii
Family: Colubridae
Classification: Reptilia (Squamata)
Toxicity Level: Non-Toxic
Origin: Indonesia (Sulawesi)
Adult Size: 1.8 – 2.4 meters (6 – 8 feet)
Lifespan: 15 – 20 years
Diet: Carnivore (Rodents, birds)
Jansen's Rat Snake is the "bodybuilder cousin" of the Red Tailed Racer. While they are born olive-green, this listing specifies the Black Phase (typically adults). These are massive, muscular arboreal snakes that look like velvet-black dragons. They have a keeled belly that helps them climb vertical tree trunks and a distinct laterally compressed body shape.
Notes Comparison: Unlike the Red Tailed Racer (G. oxycephalum), G. jansenii is much heavier, thicker, and grows larger. The Black Phase is particularly sought after for its imposing appearance.
Husbandry: They require very large arboreal cages. They are generally robust feeders on rats.
Why Source This Species:
Velvet Black Texture: Their scales have a unique matte texture that absorbs light, making the black coloration look incredibly deep and rich.
Impressive Bulk: They offer the size and presence of a python but with the activity level and handling characteristics of a colubrid.
Hardy Giant: Once established, they are one of the most robust arboreal snakes available.
