How to Identify the Guatemalan Palm Pit Viper (Identification Guide)
A field guide to recognizing this Central American arboreal pit viper by its green coloration, slender build, and highland cloud forest habitat.
Read the full Guatemalan Palm Pit Viper encyclopedia entry →
Key identifying features
The Guatemalan palm pit viper (Bothriechis bicolor) is a slender, tree-dwelling pit viper native to the highlands of Guatemala, southern Mexico, and parts of Honduras and El Salvador. It is characterized by an overall bright to yellowish-green body, a strongly prehensile tail, and a laterally compressed shape adapted for climbing through vegetation. As with all pit vipers, it has heat-sensing pits between the eyes and nostrils.
Coloration & pattern
Adults are typically uniform bright green to yellow-green above, often with little or no distinct pattern, though some individuals show faint darker green flecking or a subtle bicolored effect between the dorsal and lateral scales, which is reflected in the species' scientific name. The belly is usually pale green, yellow, or whitish, contrasting somewhat with the darker green dorsum. Juveniles may show a more yellowish tail tip in some cases, a trait shared with several arboreal pit vipers that can serve as a lure for prey.
Head, eyes & scales
The head is broad, triangular, and clearly set off from a narrower neck, a shape typical of vipers with a large venom-gland area. The eyes have vertically elliptical pupils. Dorsal scales are keeled, giving a slightly textured appearance to the green body. The head is generally the same uniform green as the body, without strong facial patterning, which helps distinguish it from patterned relatives like the yellow-blotched or black-speckled palm pit vipers.
Size & body shape
This species reaches a moderate size for the genus, with adults commonly measuring 55 to 70 cm, occasionally larger. The body is slim and laterally flattened for maneuvering along branches, and the tail is long, prehensile, and often a slightly different shade than the body, aiding in anchoring the snake while it forages or rests among foliage.
Range & habitat where you'll see it
The Guatemalan palm pit viper inhabits humid highland and cloud forest across Guatemala, Chiapas in Mexico, and parts of Honduras and El Salvador, generally at moderate to high elevations. It is almost entirely arboreal, most often encountered coiled on low branches, shrubs, or vine tangles within forest understory rather than on the ground.
How to tell it apart from look-alikes
Because it lacks bold blotching or dense speckling, the Guatemalan palm pit viper's largely unpatterned green coloration is its most useful identifying feature when compared with the yellow-blotched or black-speckled palm pit vipers, both of which show more obvious contrasting markings. Range also helps narrow identification, as its distribution overlaps with but is not identical to these related species.
Frequently asked questions
Is the Guatemalan palm pit viper patterned or solid colored?
It is mostly uniform green to yellow-green with little or no bold pattern, unlike some related palm pit vipers with blotches or speckling.
Where does this snake live?
In humid highland and cloud forest across Guatemala, Chiapas (Mexico), and parts of Honduras and El Salvador.
Does it spend time on the ground?
Rarely; it is strongly arboreal and is most often found coiled on branches, shrubs, or vines.
How can you tell it apart from the yellow-blotched palm pit viper?
The Guatemalan palm pit viper lacks the distinct pale yellow blotches seen in that species, appearing more uniformly green instead.