Coelognathus helena, commonly known as the Indo-Chinese rat snake or the common rat snake, belongs to the family Colubridae. This species is native to Southeast Asia, including regions like Thailand, Vietnam, and parts of Myanmar. Coelognathus helena is characterized by its slender body, which can reach lengths of up to 2 meters, and its distinctive coloration that typically includes a pattern of light and dark scales, often with yellow, green, or brown hues.

This snake is primarily arboreal, often found in trees and shrubs, although it can also inhabit grasslands and forests. Its diet mainly consists of small mammals, birds, and occasionally lizards, showcasing its role as a constrictor in the ecosystem. Coelognathus helena is known for its relatively docile nature, making it a popular choice in the pet trade. Additionally, it possesses a unique ability to adapt to various habitats, contributing to its wide distribution. The snake’s striking appearance and behavior, combined with its ecological importance as a predator, highlight its significance within its native environments. Conservation efforts are essential to protect its habitats from deforestation and human encroachment.