Snake Identifier
Malayan Pit Viper (Calloselasma rhodostoma)
Callos rhodos 120610-0576 krw by Wibowo Djatmiko (Wie146), via Wikimedia Commons, licensed under CC BY-SA 3.0
Vipers

Malayan Pit Viper

Calloselasma rhodostoma

A medium-sized, heavy-bodied pit viper of Southeast Asia known for its distinctive triangular head markings.

Adult length
0.5-0.9 m (1.6-3 ft)
Range
Southeast Asia including Thailand, Malaysia, Vietnam, Cambodia, and parts of Indonesia

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Overview

The Malayan pit viper is a pit viper widely distributed across Southeast Asia, including Thailand, Malaysia, Vietnam, Cambodia, and parts of Indonesia. It is a heavy-bodied, well-camouflaged ground-dwelling species often found in agricultural and lowland habitats.

It is abundant near farmland, and its cryptic, leaf-litter camouflage helps it blend into rubber, oil palm, and rice plantations.

How to identify it

  • Reddish-brown to grayish-brown body with a series of dark, triangular or hourglass-shaped blotches along the back, often edged in pale cream
  • Distinctive pale stripe running from behind the eye toward the corner of the mouth
  • Broad, triangular, arrow-shaped head clearly distinct from a narrower neck
  • Heat-sensing pit organs between the eye and nostril
  • Vertically elliptical pupils
  • Keeled, rough-textured scales
  • Stout, heavy body relative to its moderate length

Habitat & range

Found in lowland forest, scrubland, agricultural plantations (especially rubber and oil palm), rice paddies, and areas with abundant leaf litter across its Southeast Asian range, typically at low elevations.

Behavior, diet & reproduction

Primarily nocturnal, though it may be active by day in shaded conditions. A sluggish, sit-and-wait ambush predator that relies heavily on camouflage among leaf litter, striking rapidly at passing rodents, birds, and other small vertebrates. Unusually among vipers it is oviparous, laying eggs that the female guards until hatching.

Frequently asked questions

How can you identify it?

Look for its reddish-brown body with dark triangular blotches, a pale cheek stripe, and a broad, triangular head with heat-sensing pits.

Where is it commonly encountered?

In rubber and oil palm plantations, rice fields, and other lowland agricultural or forested habitats across Southeast Asia.