How to Identify the Boomslang (Identification Guide)

Key identifying features

The Boomslang (Dispholidus typus) is a slender, tree-dwelling snake best recognized by its unusually large, round eyes with a keen, alert expression, and a distinctly egg-shaped head that appears somewhat bulging or swollen relative to the thin neck. Its highly variable coloration, ranging dramatically between individuals, sexes, and age classes, is another key identification challenge and feature of the species.

Coloration & pattern

Coloration is famously variable. Adult males are often bright green with black or blue-edged scales, though they can also appear olive, brown, or even black. Adult females tend to be duller, typically brown, olive-brown, or grayish, providing better camouflage while nesting. Juveniles have a strikingly different appearance from adults, usually gray or brownish with a spotted throat, bright green or blue eyes, and a pattern that shifts as they mature. Because of this variability, coloration alone is not always a reliable identifier without considering other features.

Head, eyes & scales

The head is distinctly egg- or acorn-shaped, wider than the neck, and clearly separated from the body, giving the snake an alert, almost bird-like head profile. The eyes are unusually large for a colubrid snake, with round pupils, and are a major identifying trait, especially in juveniles that display vivid green or turquoise irides. Dorsal scales are strongly keeled, giving the body a slightly rough or textured appearance rather than glossy.

Size & body shape

Boomslangs have a slender, elongated body built for climbing, with a long prehensile-capable tail that aids in moving through branches. The body is laterally compressed to some degree, which along with their light build allows them to move efficiently through vegetation and along thin branches.

Range & habitat where you'll see it

This species is found across much of sub-Saharan Africa in savanna, woodland, and forest edge habitats. It is highly arboreal, spending most of its time in trees and shrubs rather than on the ground, where it is often seen resting motionless among foliage, relying on its coloration and stillness to remain undetected.

How to tell it apart from look-alikes

The combination of large protruding eyes, an egg-shaped head clearly wider than the neck, and strongly keeled scales helps separate the Boomslang from other African arboreal snakes such as vine snakes, which have a much more elongated, pointed head and slit-like pupils rather than round ones. Green mambas, another arboreal species sharing some habitat, have smooth scales and a narrower head lacking the Boomslang's bulging egg shape. Because juveniles and adults can look very different from one another, examining head shape and eye size together is more reliable than color alone.