Common Mock Viper

The Common Mock Viper is a small rear-fanged colubrid found across South and Southeast Asia, notable for its remarkable resemblance to true vipers despite belonging to an entirely different family. It has mild venom used primarily to subdue small prey and is generally not considered a significant hazard to humans, though bites can cause localized discomfort.

Its viper-like appearance is thought to be a defensive mimicry strategy, deterring potential predators that avoid true vipers.

• Stout, triangular head distinct from a slender neck, similar to true vipers
• Coloration variable: brown, gray, or reddish with darker blotches or a faint dorsal stripe
• Smooth scales
• Vertical, elliptical pupils, which add to its viper-like appearance
• Enlarged, plate-like shields on top of the head, unlike the small fragmented scales of true pit vipers
• Small adult size, rarely exceeding 75 cm

The large plate-like head shields and the absence of heat-sensing facial pits help separate it from true pit vipers sharing its range.

Inhabits lowland and hill forests, plantations, gardens, and forest edges from sea level up to moderate elevations. Found from India and Nepal east through Southeast Asia to southern China, Indonesia, and the Philippines. Often found under leaf litter, logs, and low vegetation.

Primarily nocturnal and terrestrial, though it can climb into low shrubs. When threatened, it flattens its body and strikes in a manner resembling a viper. Feeds on small lizards, frogs, and occasionally small mammals, subduing prey with mild venom delivered from rear fangs. Reproduction is live-bearing (ovoviviparous), with females producing small litters of young.