Asiatic Water Snake

Fascinating facts about the Asiatic Water Snake

• A single adult can reach about 1.75 m from snout to vent – roughly the length of a small dining table – yet it still fits snugly among rice paddies and shallow streams, showing how size alone doesn’t limit its watery niche.
• When threatened, it lifts its head and spreads neck skin like a cobra’s hood, a bluff that can startle predators even though the snake is completely non-venomous to humans, reminding us that intimidation can be as powerful as poison.
• Its clutch can range from a modest four eggs to a massive hundred, with each egg only 1.5–4.0 cm long; the female guards them for 60–70 days until hatchlings emerge at about 11 cm, illustrating a rare blend of high-volume reproduction and devoted parental care.
• Tail autotomy – shedding the tail to escape – has been documented at least once in Vietnam, a defense usually seen in lizards, highlighting the snake’s unexpected survival tricks.
• Found across 20+ Asian countries from Afghanistan to Indonesia, this water snake thrives in any fresh water setting, proving that a flexible habitat preference can support one of the continent’s broadest reptile distributions.

At a glance

About the Asiatic Water Snake

The checkered keelback, Fowlea piscator, glides through Asian wetlands with a sleek, medium-sized body that can reach a snout-to-vent length of 1.75 m (5.7 ft). Its head is crowned by a small eye set farther back than the nostril, and a rostral scale that is visible from above. The dorsal scales form 19 rows, the central ones strongly keeled while the outer rows are smooth, giving the snake a subtly textured appearance. Its coloration is a masterclass in aquatic camouflage: dark spots arranged in a quincunx pattern interlaced with a whitish network, or bold black longitudinal bands on a pale ground, often accented by two nearly constant oblique black streaks flanking the eye. The belly is stark white, sometimes edged with black margins, and the snake can expand its neck skin in a cobra-like hood when threatened, a surprising display for a non-venomous colubrid. By day and night this water-loving reptile patrols freshwater bodies, paddy fields, and the slow-moving streams of its extensive range, from the hills of Afghanistan to the mangroves of Indonesia. Its diet is a watery buffet of fish, amphibians, arthropods, and occasional rodents or turtle hatchlings, while the female lays a clutch of 30-70 eggs that she guards for 60-70 days before the 11 cm hatchlings emerge. In a rare twist of survival, individuals in Vietnam have been documented shedding their tails to escape predators, a dramatic autotomy seldom seen in snakes.

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