How to Identify Russell's Viper (Identification Guide)

Key identifying features

Russell's Viper is identified by its stout, heavy body and a striking pattern of three longitudinal rows of large, dark brown oval or rounded blotches, each outlined with a black and white or yellowish border, running along a pale brown, tan, or yellowish-brown background. This triple row of blotches, especially the prominent vertebral row, is the single most reliable field mark for this species across its range.

Coloration & pattern

The background color varies from pale yellowish brown to deep tan or grayish brown. The dorsal blotches are dark brown to black, roughly circular to oval, and edged with a thin lighter halo, sometimes with an additional dark outer ring, producing a chain-like or "eye" pattern effect. Two additional rows of smaller blotches run along the flanks below the vertebral series. The belly is pale, often with scattered dark crescent-shaped or semicircular marks along the sides.

Head, eyes & scales

The head is large, broad, and distinctly triangular, clearly set off from a narrower neck, a typical viper feature associated with venom glands. Eyes are large with vertically elliptical pupils, and a dark stripe often runs from the eye to the corner of the jaw. Dorsal scales are strongly keeled, giving the body a rough, textured appearance, and the tail is short, ending abruptly rather than tapering to a fine point.

Size & body shape

Russell's Viper is a heavy-bodied, robust snake, with adults commonly reaching 100 to 150 centimeters and occasionally more. The body is thick relative to its length, tapering to a comparatively short, stout tail, giving it an overall powerful, muscular build distinct from more slender colubrids sharing its habitat.

Range & habitat where you'll see it

This species is widespread across South and Southeast Asia, including India, Sri Lanka, Bangladesh, Myanmar, Thailand, and parts of China and Indonesia. It favors open grassland, scrubland, agricultural fields, and areas with abundant rodent prey, often being encountered near human habitation, rice paddies, and farmland edges, particularly at dusk and night.

How to tell it apart from look-alikes

The combination of a triangular head, keeled scales, and three rows of dark oval blotches with light borders distinguishes Russell's Viper from other vipers and pit vipers in its range, many of which show different blotch shapes or fewer dorsal rows. Its short, abruptly tapering tail and heavy body further separate it from slimmer colubrid snakes that may share a superficially blotched pattern. As this is a medically significant, highly venomous species, visual identification should be approached with caution and distance.