Indian Rat Snake
Ptyas mucosa
One of the largest and most commonly encountered snakes in South Asia, a fast-moving diurnal hunter that plays a major role in controlling rodent populations.
- Venomous?
- Non-venomous
- Adult length
- 1.5-2.5 m (5-8 ft), occasionally to 3 m
- Range
- Indian subcontinent and Southeast Asia
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Overview
The Indian rat snake, locally known as the dhaman, is a large, robust colubrid widely distributed across the Indian subcontinent, Sri Lanka, and much of Southeast Asia. It is one of the most frequently seen large snakes in agricultural and urban landscapes throughout its range.
As a member of the family Colubridae, it belongs to the largest and most diverse snake family. It is non-venomous and harmless to humans, though it can be defensive and bite if cornered.
Its abundance near human settlements and its role as a rodent predator have made it culturally familiar in many parts of South Asia.
How to identify it
The Indian rat snake has a long, muscular body with smooth to weakly keeled dorsal scales toward the rear of the body. Coloration is variable, ranging from olive-brown to yellowish or grayish, often with darker crossbands or a diamond-like pattern on the posterior body.
- Large, elongated head barely distinct from the neck
- Round pupils typical of diurnal colubrids
- Adults commonly reach 1.5-2.5 m, among the longest snakes in the region
- Often confused with cobras when it raises its forebody defensively, though it lacks a hood
- Tail is long and tapering relative to body length
Habitat & range
This adaptable species occupies a wide range of habitats including open forest, grassland, cultivated fields, wetlands, and densely populated urban and suburban areas. It is frequently found near human dwellings, granaries, and farmland where rodent prey is abundant.
Its range extends from Iran and Afghanistan through the Indian subcontinent to Southeast Asia and southern China, spanning lowlands up to moderate elevations.
Behavior, diet & reproduction
The Indian rat snake is strictly diurnal and highly active, often seen moving rapidly across open ground or climbing into low vegetation and trees. When threatened, it may raise the front third of its body, hiss loudly, and vibrate its tail in a bluffing display.
Its diet consists primarily of rodents, along with birds, frogs, and other small vertebrates, which it actively pursues and overpowers rather than constricting tightly. It is oviparous, laying clutches of roughly 6 to 16 elongated eggs during the warmer months.
Frequently asked questions
Is the Indian rat snake venomous?
No, it is completely non-venomous and poses no medically significant threat to humans.
How big does the Indian rat snake get?
Adults typically reach 1.5-2.5 m, with some individuals approaching 3 m, making it one of the largest snakes in South Asia.
Where is the Indian rat snake found?
It ranges across the Indian subcontinent, Sri Lanka, and much of Southeast Asia, in habitats from farmland to forest edges.
Why does the Indian rat snake sometimes look like a cobra?
When alarmed it raises its forebody and hisses in a bluff display, but it has no hood and is a different family entirely.
Indian Rat Snake guides
In-depth guides for identifying and understanding Indian Rat Snake.
