How to Identify the White-Lipped Pit Viper (Identification Guide)
The White-Lipped Pit Viper is a green arboreal viper identified by its pale white or yellow lip scales, triangular head, and reddish tail tip.
Read the full White-Lipped Pit Viper encyclopedia entry →
Key identifying features
The White-Lipped Pit Viper is identified by its bright green body combined with a pale white, cream, or yellowish stripe running along the upper lip scales, which stands out clearly against the green head coloration. Along with the triangular head and heat-sensing facial pits typical of pit vipers, this pale lip coloration is the most distinctive field mark for the species.
Coloration & pattern
The dorsal color is a uniform to slightly variegated bright green, sometimes with a faint bluish or yellowish tinge. A pale lateral stripe, often whitish or pale yellow, may run along the lower body in some individuals, though the white lip coloration along the labial scales is the more consistent diagnostic feature. The belly is pale green or yellowish, and the tail tip is typically reddish brown, standing out against the green body.
Head, eyes & scales
The head is broad, flattened, and triangular, clearly wider than the neck, with the diagnostic pale lip scales visible along the edge of the mouth. Eyes have vertically elliptical pupils, often golden or coppery in color, and heat-sensing pits are present between the eye and nostril. Dorsal scales are keeled, giving a slightly rough texture to the otherwise smooth-looking green body.
Size & body shape
This is a small to medium pit viper, typically reaching 60 to 90 centimeters, with a slender, laterally compressed body well suited for climbing. The tail is prehensile-capable and usually reddish brown, contrasting with the green body and aiding balance while moving through branches and dense foliage.
Range & habitat where you'll see it
The White-Lipped Pit Viper is found across parts of Southeast Asia and southern China, inhabiting forests, bamboo thickets, and vegetated areas near streams and agricultural edges. It is primarily arboreal and nocturnal, commonly found coiled on low branches, shrubs, or vegetation, particularly in humid, forested environments.
How to tell it apart from look-alikes
The pale white or yellowish lip stripe is the clearest distinguishing feature separating this species from other similarly green arboreal pit vipers in the same region, many of which lack this contrasting lip coloration or show it less distinctly. The reddish tail tip, triangular head, and heat-sensing pits provide additional confirming features, though close comparison with regional field guides is recommended since several green pit viper species can appear quite similar.
Frequently asked questions
What is the key identifying feature of the White-Lipped Pit Viper?
A pale white, cream, or yellowish stripe along the upper lip scales that contrasts with its green head.
What color is the body typically?
A bright to slightly variegated green, sometimes with a faint bluish or yellowish tinge.
Does the tail differ in color from the body?
Yes, the tail tip is usually reddish brown, standing out clearly against the green body.
How large does this species grow?
Typically 60 to 90 centimeters, with a slender, laterally compressed body suited to climbing.
Where is the White-Lipped Pit Viper found?
In forests, bamboo thickets, and vegetated areas across Southeast Asia and southern China.