Celebes Black-Tailed Ratsnake

Gonyosoma jansenii, commonly known as the Celebes black-tailed rat snake, the Celebes ratsnake, and Jansen's rat snake, belongs to snake in the subfamily Colubrinae of the family Colubridae. The specific name, jansenii, is in honor of Albert Jacques Frédéric Jansen, who was an administrator in the Dutch East Indies. A long snake, G. jansenii may attain a total length of 199 cm (6.53 ft), which includes a tail length of 45 cm (1.48 ft). (Wikipedia, general species account).

Adults are olive or yellowish brown on the anterior and middle portions of the body, with some scales black-edged. They are entirely black on the posterior portion of the body and tail (Boulenger, 1894). This species is endemic to the Indonesian island of Sulawesi. The preferred natural habitat of G. jansenii, is forest, at altitudes from sea level to 1,000 m (3,300 ft). (Wikipedia, general species account).