Indo-Chinese Rat Snake

Fascinating facts about the Indo-Chinese Rat Snake

• A 1.08-meter (43-inch) adult can stretch its tail another 0.7 m (28 in), giving it a total length that rivals a small garden hose – a size that lets it chase prey both on the ground and up branches, showing how versatility can be built into a single body plan.
• Its back is covered in just 15 rows of smooth or faintly keeled scales, while the belly bears 160–177 large ventral plates and 122–145 sub-caudal plates, a scale count that balances flexibility for arboreal climbs with protection for a life spent hunting rodents and birds.
• Living from sea level up to 3,000 m, this snake is found at high elevations.
• Females lay between 4 and 12 eggs each June–July, a clutch size that mirrors the number of hatchlings a small bird might produce, highlighting a reproductive strategy that leans on quality over sheer quantity.
• Found across a patchwork of countries, from Nepal and Bangladesh to Indonesia’s Java and Bali, and even Hong Kong, its distribution reads like a map of Southeast Asia’s most diverse habitats, underscoring how a single species can bridge vastly different ecosystems.

At a glance

About the Indo-Chinese Rat Snake

The Indo-Chinese rat snake, Ptyas korros, is a striking colubrid whose head projects with an obtuse snout and unusually large eyes, giving it a vigilant expression. Its head is broader than the neck, and the rostral scale is visible from above. The dorsal scales are smooth, becoming faintly keeled toward the rear, arranged in fifteen rows at mid-body, and the snake boasts a ventral count of 160–177. Adults reach a total length of about 1,080 mm (43 in) with a tail adding another 700 mm (28 in). Its coloration varies from brown to olive on the back, often highlighted by yellow scales edged in black on the posterior body and tail, while the belly is a vivid yellow. Juveniles display transverse rows of whitish spots or narrow yellow bars, a pattern that fades as they mature. This diurnal predator navigates both arboreal and terrestrial realms, slipping through forest canopies and the edges of human settlements, where it sleeps perched on bushes and trees. A versatile forager, Ptyas korros preys on rodents, birds, lizards and frogs, capitalizing on its keen vision and agile movement. Females lay clutches of four to twelve eggs during the monsoon-aligned months of June and July, timing hatchlings to a season of abundant prey. One surprising trait is its ability to thrive up to 3,000 m above sea level, a testament to its physiological adaptability across the varied landscapes of Southeast Asia, from the hills of Nepal to the lowland forests of Indonesia.

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