White-lipped Tree Viper

Fascinating facts about the White-lipped Tree Viper

• A 24-inch male can grow up to 600 mm long, while females reach 32 in (810 mm).
• When counting the scales along its midbody, you’ll find usually 29 rows, though rare individuals show just 19 – such variation helps herpetologists untangle regional lineages across its wide range.
• The snake’s belly may be green, yellowish, or white, but only males display a light ventrolateral stripe; females lack it entirely, providing a quick field clue to sex without handling the animal.
• Its diet of birds, tiny frogs, and small mammals is captured by a firm grip rather than a strike-and-release, meaning the viper subdues prey until death, a tactic that reduces the chance of losing a meal in the canopy.
• Bite outcomes range from mild symptoms to death because the venom is hemotoxic with strong procoagulant effects, yet recorded fatalities are few, underscoring how even dangerous venoms can vary widely in real-world impact.

At a glance

About the White-lipped Tree Viper

The white-lipped tree viper, Trimeresurus albolabris, is a sleek arboreal pit viper cloaked in vivid green, its head framed by a striking yellow-white band below the eyes that sets it apart from its forest companions. Males reach up to 600 mm while females can grow as long as 810 mm, their tails accounting for roughly one-fifth of that length; the snake’s scalation is a mosaic of smooth, feebly keeled plates, with 10–11 upper labials and a midbody count of 29 dorsal rows. In the dappled canopies of Nepal, Bhutan, Myanmar, Thailand, Cambodia, Laos, Vietnam, southern China and the Indonesian archipelago, it perches on branches, its green belly blending with sun-flecked leaves, ready to ambush the birds, tiny frogs, and rodents that form its diet. Unlike many vipers that strike and release, this species clutches its prey, holding on until the victim succumbs to its hemotoxic venom, a cocktail that not only disrupts blood clotting but can, in rare cases, be fatal. A surprising trait is the sexually dimorphic ventrolateral stripe, present in every male but absent in females, hinting at subtle visual cues that may play a role in mate recognition amid the tangled foliage, a reminder that even well-studied reptiles still guard secrets in their emerald realms,

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