Sindh Saw-scaled Viper

Fascinating facts about the Sindh Saw-scaled Viper

• At just 38–80 cm long, this viper is the smallest of India’s notorious “big four” snakes, yet its bite accounts for a disproportionate share of snakebite deaths because it hides in busy human habitats. Its size lets it slip under rocks and into burrows, making it easy to step on unnoticed.
• When rain falls, up to 80 % of adult snakes climb into bushes or trees, and observers once counted about 20 individuals crowding a single cactus.
• A single bite can deliver as much as 12 mg of dry venom, while the lethal dose for an adult human is estimated at only 5 mg. Even though the average venom yield is just 18 mg, the mortality rate is about 20%.
• Females give birth to live young ranging from 115 to 152 mm, usually in litters of 3–15, though a record of 23 hatchlings exists.
• The snake’s side-winding motion keeps only two points of its body touching hot sand, preventing rapid overheating while allowing it to move quickly across loose substrates.

At a glance

About the Sindh Saw-scaled Viper

The Sindh saw-scaled viper, Echis carinatus, is a compact, sharply patterned serpent that rarely exceeds 60 cm in length, though some individuals reach 80 cm. Its head is set apart from the neck, crowned by a short, rounded snout and a distinctive whitish cruciform or trident mark on the crown. The dorsal surface shimmers in pale buff, grayish, reddish, olive or brown tones, punctuated by a series of whitish spots edged in dark brown and bisected by lighter patches; white bows trace the dorsolateral line, while the belly ranges from plain whitish to pinkish, sometimes speckled with faint brown dots. Scale counts reveal 25–39 rows of keeled dorsal scales with serrated keels on the flanks, 143–189 ventrals, and 21–52 undivided subcaudals, all contributing to a texture that aids its sidewinding across sand, rock, and soft soil. When night falls or after a rain, this crepuscular hunter emerges from hidden burrows, rock fissures, or rotting logs, often climbing up to two metres into bushes and even massing on a single cactus. Its diet is opportunistic, rodents, lizards, frogs, scorpions, centipedes and large insects, allowing it to thrive in the scrublands, dunes and mountainous foothills of the Indian subcontinent, the Middle East and Central Asia, from sea-level coasts to Balochistan heights of 1 982 m. A surprising trait is its aggressive, double-coil defense: a figure-of-eight posture that lets it strike like a released spring, a behavior that, combined with its inconspicuous size, makes it one of the “big four” snakes responsible for the highest snakebite incidence in densely populated regions.

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