The Buff-Striped Keelback Explained

The buff-striped keelback (Amphiesma stolatum) is a small, gentle, non-venomous grass snake of wet fields, gardens and stream banks, recognised by two pale buff stripes running down its back, and it is among the most harmless snakes in India. The buff-striped keelback feeds mainly on frogs and toads, almost never bites, and is one of the snakes people most often meet around homes and paddy fields.

Because the buff-striped keelback is common, small and visible by day, it is also one of the snakes most frequently killed out of fear. This explainer describes how to recognise the buff-striped keelback, where it lives, what it eats, how it behaves and why it is a useful neighbour, based on stable, widely documented facts about the species.

Key Takeaways

• The buff-striped keelback is a small, non-venomous colubrid snake with two buff-coloured stripes along its back.
• Frogs and toads make up most of the buff-striped keelback’s diet, which links the snake closely to wet fields, ponds and gardens.
• The buff-striped keelback rarely bites, usually trying to escape, and even a bite from this species is not medically dangerous.
• The name “keelback” refers to the ridged, or keeled, scales along the snake’s back, a feature shared by many unrelated snakes.
• Not every snake called a keelback is harmless, because a few species in a different genus have rear fangs, so identification matters.
• Native snakes such as the buff-striped keelback are protected under the Wildlife (Protection) Act, 1972.

What is the buff-striped keelback?

The buff-striped keelback is a small, non-venomous snake of the family Colubridae that lives across South Asia and is named for the pair of pale buff stripes along its back and the keeled scales that give “keelback” snakes their name. It is a typical grass snake, slender and quick, and found close to water.

The species was described by Carl Linnaeus in 1758 and has been moved between genera as classification methods have changed. Many field guides and websites still use the name Amphiesma stolatum, while some recent works place related species in other genera. The common name, however, has stayed stable: buff-striped keelback or striped keelback.

Within India, the buff-striped keelback is regarded as one of the commonest snakes of lowland and hill country, and many people know it by local names in their own language. Its calm temperament is a large part of why herpetologists describe it as one of the gentlest snakes to be found near people.

How do you identify a buff-striped keelback?

A buff-striped keelback can be identified by two cream or buff stripes running lengthwise along the back, with dark crossbars or blotches between them, a brownish or olive body and a pale belly. The head is often a plain olive or brown, and there is usually a pale patch near the neck.

Key identification features include the following.

• Dorsal stripes: Two pale buff or yellowish stripes run from behind the head down the back. These are the namesake feature.
• Dark bars: Between the stripes, dark bars or chequered markings give the back a ladder-like appearance, especially in the front half of the body.
• Keeled scales: Each dorsal scale has a small ridge, so the skin looks slightly rough rather than glossy.
• Size and build: The snake is small and slender, with a moderately long tail and a head only slightly wider than the neck.
• Behaviour: It tends to escape quickly into grass or water rather than stand its ground.

Colour and pattern vary with region, age and light, and some individuals look duller or more reddish. Young snakes can look brighter than adults. If a clear photograph is available, a trained rescuer can usually confirm the species in seconds.

Where does the buff-striped keelback live?

The buff-striped keelback lives in damp, vegetated places across India, including paddy fields, ponds, stream banks, marshy ground, gardens, roadside drains and forest edges, and it ranges widely across South Asia. Its presence is closely tied to the availability of frogs.

The species is found from the plains up into low and middle hills, and it is common in agricultural land. It does well in areas where irrigation, rain and paddy cultivation produce abundant amphibians. Typical places to meet one include the following.

• Flooded paddy fields during and after the monsoon
• Garden beds, lawns and leaf litter near ponds or water tanks
• Edges of streams, canals and irrigation channels
• Low scrub and tall grass around villages
• Forest clearings and damp ground in the hills

Population sizes are not precisely known, and local numbers rise and fall with rainfall and habitat change. In general, the buff-striped keelback is regarded as widespread and often abundant, though drainage of wetlands, pesticide use and road traffic can reduce local numbers.

What does the buff-striped keelback eat?

The buff-striped keelback eats mostly frogs and toads, along with tadpoles, and it also takes small fish and, occasionally, skinks and other small animals. Amphibians are its main prey, which is why the snake is so often found near water.

The snake hunts actively by day, moving through grass and shallow water and flicking its tongue to detect prey. It grabs a frog in its jaws and swallows it whole, usually head first. It does not kill with venom, and a frog is often still struggling when swallowed. The snake can also tackle toads, though toads carry skin toxins, and some keelback relatives in other regions are known to cope with such defences.

Because it eats so many amphibians, the buff-striped keelback sits in the middle of the wetland food web. It is itself eaten by larger snakes such as rat snakes, by birds of prey, herons, mongooses and monitor lizards.

Is the buff-striped keelback venomous or dangerous?

The buff-striped keelback is not venomous in any way that matters to humans, and it is considered harmless. It will often flee at the first sign of a person, and a bite is both rare and trivial.

When cornered or handled, the buff-striped keelback may flatten its neck, raise the front of its body and give a mock strike with its mouth closed or slightly open. These are defensive bluffs. Some specimens release a foul-smelling fluid from the base of the tail, a typical response of small colubrids to being grabbed. None of these behaviours pose any danger.

It is important to keep one caution in mind. A different group of keelbacks, in the genus Rhabdophis, has rear fangs and is mildly venomous, and one such species is the red-necked keelback found in parts of north-eastern India. The word “keelback” therefore does not by itself prove a snake is safe. The buff-striped keelback, however, is clearly not in that group, and its two buff stripes and typical small size make it easy to separate once you know what to look for.

How does the buff-striped keelback behave?

The buff-striped keelback behaves as a shy, quick, daytime snake that prefers to flee into cover, and it is semi-aquatic, swimming easily and hunting along water edges. It may bask on a path or a bund in the morning and slip away when disturbed.

Observers note several typical behaviours.

• Fleeing first: The snake bolts into grass, a drain or a crevice when approached.
• Neck flattening: If it cannot escape, the neck may flatten and the snake may rear up slightly.
• Swimming: The buff-striped keelback swims well, with the head held just above water.
• Basking: Mornings and early afternoons are common times to see it warming itself.
• Seasonal activity: It is often seen more in and after the monsoon, when frogs are abundant.

Unlike nocturnal snakes, it is easily seen, which is why people find it more often than many other species. That visibility is partly why the buff-striped keelback is among the snakes most often misidentified and needlessly killed.

How does the buff-striped keelback breed?

The buff-striped keelback breeds by laying eggs, with the female depositing a clutch in a moist, hidden spot such as loose soil, leaf litter, a crevice or a hollow, usually around the monsoon season. The young hatch fully formed and begin to hunt tiny frogs and tadpoles almost immediately.

Exact clutch size depends on the female’s size and location, and published numbers vary, so figures should be treated as approximate. As with most colubrids, the female does not provide care after laying. Hatchlings are tiny and vulnerable, and most do not survive to adulthood because they are eaten by birds, other snakes, frogs and large insects. That heavy early mortality is normal in snake populations.

How can the buff-striped keelback be told apart from similar snakes?

The buff-striped keelback can be told apart from similar snakes by its two buff dorsal stripes, its small size and its typical wetland habitat. Several other snakes share some features, and the table below summarises the main contrasts.

The simplest rule is to look for the paired stripes and to note daytime activity near water. Kraits are largely night-active, while the buff-striped keelback is mostly seen by day. When identification is uncertain, the safe course is to stay back and consult a local rescuer.

What should you do if you find a buff-striped keelback at home?

If you find a buff-striped keelback at home, the best action is to stay calm, keep your distance, and let the snake move on, since it will usually leave of its own accord. It poses no threat to people and little to pets.

• Do not attempt to pick it up, pin it or strike it, since a handled snake is more likely to defend itself.
• Keep children and pets away until the snake has gone.
• Open a path to the garden or a drain so that it can escape easily.
• If it is trapped inside a building, call the forest department helpline or a trained snake rescue volunteer.
• To discourage visits, reduce standing water, tall grass and heaps of debris near the house, which attract frogs.

Killing a buff-striped keelback is unnecessary, and as a native snake it is covered by the Wildlife (Protection) Act, 1972, which restricts killing and capture.

Why does the buff-striped keelback matter?

The buff-striped keelback matters because it is an important predator of frogs and toads, which are themselves linked to insect populations, and because it serves as prey for larger animals, making it a link in the wetland food web. Its presence suggests that a wet habitat still supports a living amphibian community.

For farmers in paddy country, a healthy snake community also helps keep rodents and other pests in check, even though the buff-striped keelback itself eats amphibians rather than rodents. The more important point is that a balanced ecosystem benefits from all its members. The main threats to the species are habitat loss, drainage of wetlands, chemical pollution that harms amphibians, road mortality and direct killing out of fear.

Education is the most effective protection. When people learn that a striped snake in a rice field or a garden bed is a gentle frog-eater, they are far more likely to let it pass.

Bottom Line

The buff-striped keelback is a small, calm, non-venomous snake that lives close to water, eats frogs and toads, and almost never bites. Learning to recognise its two buff stripes can prevent the needless killing of one of India’s most harmless and most common snakes.

Frequently Asked Questions

Is the buff-striped keelback poisonous?

No, the buff-striped keelback is not venomous or poisonous in any way that matters to people. It is considered harmless and rarely bites. Even a bite would at most cause a minor scratch.

What does a buff-striped keelback look like?

A buff-striped keelback is a small, slender snake with two pale buff stripes running down its olive or brown back. Dark bars between the stripes give a ladder-like look, and the belly is pale. Its scales are keeled, giving the skin a slightly rough texture.

What does the buff-striped keelback eat?

The buff-striped keelback eats mainly frogs and toads, plus tadpoles and occasionally small fish or skinks. It hunts by day near water and swallows prey whole. It does not use venom to subdue its food.

Are all keelback snakes harmless?

No, not all keelbacks are harmless, although the buff-striped keelback is. A few keelbacks in the genus Rhabdophis, such as the red-necked keelback, have rear fangs and are mildly venomous. This is why careful identification matters.

Should I kill a buff-striped keelback found in my garden?

No, there is no need to kill a buff-striped keelback, since it is harmless and eats frogs and toads. It will usually leave on its own. Native snakes are also protected by the Wildlife (Protection) Act, 1972.

Where is the buff-striped keelback found in India?

The buff-striped keelback is found across much of India in damp habitats such as paddy fields, gardens, ponds and stream edges, from the plains into the hills. It is widespread and often common, though local numbers vary. It also occurs in neighbouring countries of South Asia.

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