How to Identify the Green Keelback (Identification Guide)
A slender, bright green South Asian snake with fine black speckling and rough keeled scales, often mistaken for venomous vipers.
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Key identifying features
The green keelback (Rhabdophis plumbicolor / Macropisthodon plumbicolor) is identified by its bright grass-green to olive-green body, fine black speckling or crossbars scattered across the back, and strongly keeled scales that give a rough, ridged texture. Its vivid uniform green color combined with a relatively stout build often leads to confusion with venomous pit vipers, though the head shapes and other traits differ.
Coloration & pattern
The body is a bright, fairly uniform green or olive-green, often with fine black flecking or a scattering of black-edged scales, particularly noticeable near the front of the body. Some individuals show faint darker crossbands, especially when young. The belly is typically pale green to yellowish.
Head, eyes & scales
The head is moderately broad but not strongly triangular, distinguishing it from vipers despite superficial color similarity. Eyes are large with round pupils, unlike the vertical pupils of venomous pit vipers found in the same region. Scales are strongly keeled, producing a rough, matte texture rather than the smooth or glossy look of many other green snakes.
Size & body shape
Adults typically reach 50 to 75 cm (20 to 30 inches), with a moderately stout, cylindrical body and a relatively short tail compared to slender green tree snakes.
Range & habitat where you'll see it
The green keelback is found across the Indian subcontinent, including India, Sri Lanka, Nepal, and Bangladesh, inhabiting grasslands, forest edges, and agricultural areas, often in moist or hilly regions. It is primarily terrestrial and diurnal, frequently found in leaf litter, grass, and under vegetation, particularly active during and after the monsoon season.
How to tell it apart from look-alikes
Green pit vipers have a distinctly triangular head, vertical pupils, and a heat-sensing pit between the eye and nostril, all absent in the green keelback, which has a rounder head and round pupils. Green vine snakes are much more slender with a pointed, elongated snout, unlike the greener keelback's stouter build. The rough keeled scales, round pupils, and non-triangular head are the key features separating this harmless-looking but rear-fanged species from dangerous green vipers.
Frequently asked questions
How can you tell a green keelback from a venomous green pit viper?
The green keelback has a round, non-triangular head and round pupils, while pit vipers have a triangular head, vertical pupils, and a heat-sensing pit near the nostril.
Is the green keelback venomous?
It is a rear-fanged species with venom that can cause localized reactions; it is generally regarded as posing limited risk to humans but should not be handled.
What texture do the scales of a green keelback have?
Strongly keeled, giving a rough, ridged texture rather than a smooth or glossy appearance.
Where does the green keelback live?
In grasslands, forest edges, and agricultural areas across the Indian subcontinent, often in moist or hilly terrain.
When is the green keelback most active?
It is diurnal and particularly active during and after the monsoon season.