W
Species Profile

Western Green Mamba

Dendroaspis viridis

Green lightning in the West African trees
PRILL/Shutterstock.com

Western Green Mamba Distribution

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Western green mamba in a tree

At a Glance

Wild Species
Also Known As Green mamba, West African green mamba, African green mamba, Mamba
Diet Carnivore
Activity Diurnal
Lifespan 10 years
Status Least Concern
Did You Know?

Adults usually reach 1.5-2.2 m total length; maximum reported about 2.5 m (Spawls & Branch, 2020).

Scientific Classification

The Western green mamba is a highly venomous, largely arboreal elapid snake native to West Africa. It is slender and usually bright green, spending much of its time in trees and shrubs. Like other mambas, it is alert and fast-moving, preying mainly on birds and small mammals.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Elapidae
Genus
Dendroaspis
Species
viridis

Distinguishing Features

  • Slender, arboreal body and long tail
  • Usually uniform bright green coloration
  • Large eyes with round pupils
  • Highly neurotoxic elapid venom

Physical Measurements

Length
6 ft 7 in (4 ft 11 in – 8 ft 6 in)
Top Speed
7 mph
slithering
Venomous

Appearance

Primary Colors
Secondary Colors
Skin Type Smooth scales
Distinctive Features
  • Adult length usually 1.4-2.1 m; maximum about 2.6 m reported.
  • Slender, laterally compressed body adapted for fast arboreal movement.
  • Head narrow and elongated with large eyes and round pupils.
  • Dorsal coloration typically solid green; juveniles often duller blue-green.
  • Pale mouth lining; not the dark mouth seen in black mamba.
  • Primarily arboreal in West African forests, thickets, plantations, mangroves.
  • Prey mainly birds, nestlings, and small mammals taken in trees.
  • Venom predominantly neurotoxic; bites are medically significant and rapid-onset.

Sexual Dimorphism

Sexes are similar in coloration and pattern; differences are mainly proportional. Females tend to reach greater total length and mass, while males often have relatively longer tails due to hemipenes.

♂
  • Relatively longer tail beyond the vent than similarly sized females.
  • Body often slightly more slender at the same total length.
♀
  • Often attain greater total length and heavier body mass.
  • Mid-body girth commonly more robust in large adult females.

Did You Know?

Adults usually reach 1.5-2.2 m total length; maximum reported about 2.5 m (Spawls & Branch, 2020).

It is mainly diurnal and arboreal, often hunting among shrubs, lianas, and forest-edge canopy.

Diet is dominated by birds and small mammals; it readily takes nestlings and roosting prey (Spawls & Branch, 2020).

Like other mambas (genus Dendroaspis), its venom is primarily neurotoxic, making bites a rapid medical emergency.

Females are oviparous, laying roughly 6-17 eggs in sheltered sites (reported for D. viridis; Spawls & Branch, 2020).

Western green mamba is West African; the similar-looking Eastern green mamba (D. angusticeps) is native to East Africa.

Records from managed care suggest captivity can exceed a decade; maximum reported longevity is ~18 years in zoo collections (Species360/ZIMS summaries).

Unique Adaptations

  • Vivid green dorsum provides camouflage in sunlit leaves, aiding ambush and reducing detection by birds.
  • Large eyes and a diurnal hunting strategy support visually guided predation in complex arboreal habitats.
  • Long, slender body and smooth movement allow efficient climbing on thin branches and tangled lianas.
  • Potent, fast-acting neurotoxic venom (shared mamba trait) rapidly immobilizes prey like birds.
  • Elapid fixed front fangs deliver venom efficiently during quick, short-contact strikes in tight vegetation.

Interesting Behaviors

  • Perches motionless in foliage, then bursts into rapid, direct pursuit of birds or fleeing rodents.
  • Often chooses escape over confrontation, using dense vegetation and speed as primary defenses.
  • Uses elevated head-and-neck "surveying" posture to visually track movement in bright daylight.
  • Can strike repeatedly when cornered, then retreats upward into cover rather than holding ground.
  • Shows strong edge-habitat use, moving along forest margins, farms, and coastal thickets where prey is abundant.

Cultural Significance

Across West Africa, mambas are widely treated with caution and respect in farming and forest communities, shaping safety practices and "danger-snake" reputations; today they also influence public health messaging about rapid treatment and antivenom access.

Myths & Legends

The name "mamba" is commonly traced to Zulu "imamba," later adopted by early zoologists for Dendroaspis in African natural-history writing.

In West African forest-edge communities, "green snake in the trees" stories are used as cautionary warnings for children and farm workers moving through dense foliage.

African snake folklore often frames highly venomous tree snakes as guardians of thickets or boundaries-places where careful behavior is demanded by tradition.

Conservation Status

LC Least Concern

Widespread and abundant in the wild.

Population Unknown

Life Cycle

Birth 10 hatchlings
Lifespan 10 years

Lifespan

In the Wild
7–15 years
In Captivity
12–20 years

Reproduction

Mating System Promiscuity
Social Structure Solitary
Breeding Season Data deficient; presumed rainy season breeding
Breeding Pattern Seasonal
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Solitary adults likely meet only briefly during seasonal breeding; mating occurs via internal fertilization (male hemipenes). Females lay reported clutches of about 6-17 eggs in hidden sites and provide no parental care; multiple mating is probable.

Behavior & Ecology

Social Solitary Group: 1
Activity Diurnal
Diet Carnivore small birds

Temperament

Alert
Defensive
Avoidant
Highly mobile

Communication

hiss
tongue-flick chemoreception
pheromone cues
visual threat display
substrate vibrations

Habitat

Biomes:
Tropical Rainforest Tropical Dry Forest Savanna
Terrain:
Coastal Plains Hilly Riverine
Elevation: Up to 3937 ft

Ecological Role

Arboreal mesopredator regulating bird and small-mammal populations in West African forests.

rodent population control trophic regulation

Diet Details

Main Prey:
Small birds Nestling birds Tree rodents Mouse Lizard

Human Interaction

Domestication Status

Wild

Wild species with no domestication or selective breeding history. Human management is limited to professional captive husbandry for venom collection, antivenom production, education, and research; not for food, labor, or companionship.

Danger Level

Extreme
  • Highly neurotoxic envenomation; respiratory paralysis risk
  • Fast, alert, arboreal; difficult to restrain safely
  • Bites can be fatal without urgent antivenom
  • Adult length commonly ~1.8-2.1 m; max ~2.6 m
  • Human encounters in plantations, gardens, forest edges

As a Pet

Not Suitable as Pet

Legality: Often illegal or permit-only; varies by jurisdiction.

Care Level: Expert Only

Purchase Cost: $300 - $1,200
Lifetime Cost: $5,000 - $20,000

Economic Value

Uses:
Research Healthcare Education Pet trade
Products:
  • venom
  • antivenom

Relationships

Predators 5

African harrier-hawk Polyboroides typus
Congo serpent eagle Dryotriorchis spectabilis
Brown Snake Eagle Circaetus cinereus
Nile monitor
Nile monitor Varanus niloticus
Egyptian mongoose Herpestes ichneumon

Ecological Equivalents 4

Animals that fill a similar ecological role in their ecosystem

Boomslang
Boomslang Dispholidus typus An arboreal, diurnal forest snake that frequently preys on birds and nestlings.
Green bush viper Atheris chlorechis An arboreal West African forest ambush predator that feeds on small mammals and birds.
Twig snake
Twig snake Thelotornis kirtlandii Slender arboreal hunter in woodland that preys on small birds and lizards.
African green bush snake Philothamnus irregularis Fast, green, arboreal/semi-arboreal; occurs in shrubs and forest edges.

Western green mambas can reach a length of up to eight feet.

A collection of bright green scales is just one of the many notable things about this snake. It can also travel through its tropical forest or savanna habitat at an average speed of 7 miles per hour! The western green mamba consumes a diet of birds, squirrels, and mice. It has potent venom with the potential to cause death.

Western Green Mamba Infographic

4 Amazing Facts

  • These snakes sleep on tree branches surrounded by leaf cover
  • The symptoms of this snake’s venom begin to occur within 15 minutes of the bite
  • Newly hatched snakelets can be as long as 17 inches
  • They have impressive speed both in trees and on the ground

Where to Find Them

This snake lives in the western part of Africa. It’s found in the countries of Benin, Gambia, Guinea, Guinea-Bissau, Senegal, Sierra Leone, and Togo.

They live in a tropical savanna, mangrove, rainforest, or tropical dry forest habitat. While they spend most of their time in the trees, they are also found on the ground hunting, looking for water, or searching for mates. They are active and most visible during the daylight hours.

Types of Mambas

Jameson's mamba,Dendroaspis jamesoni
Jameson’s Mamba is a close relative of the Western Green Mamba.

There are a total of four species of mamba snake. They are members of the Elapidae family.

  • Eastern green mamba (Dendroaspis angusticeps)-The eastern green mamba has bright green scales just like its western counterpart and is very similar in size. A big difference is that the eastern green mamba lives in the eastern part of Africa.
  • Black mamba (Dendroaspis polylepis)-Though western green mambas and black mambas are both African snakes, there are several differences between them. Contrary to its name, the black mamba isn’t always black. It can be brownish or gray in color. Also, at up to 14 feet plus, the black mamba is larger in size than the western green mamba.
  • Jameson’s mamba (Dendroaspis jamesoni)-Jameson’s mamba and the western green species are approximately the same size and have green scales. A difference between these snakes is the female Jameson’s mamba usually has a larger number of eggs.

Scientific Name

Dendroaspis viridis is the scientific name of a western green mamba snake. The Latin word Dendroaspis means tree asp and the word Viridis means green. It’s part of the Elapidae family and the class Reptilia.

Population and Conservation Status

The population information on the IUCN Red List of Threatened Species doesn’t include a specific number, but the western green mamba is of Least Concern. It’s thought of as common in many areas, and its population is stable.

Appearance and Description

Juvenile green mamba striking a pose. Juveniles are blue-green, becoming bright green when they are around 75 centimeters (2 ft 6 in) long.

Juveniles are blue-green, becoming bright green when they are around 2 ft 6 in long.

The western green mamba has bright green scales on its back that fade to yellow near its tail. It has yellow scales on its belly. Each of its green scales has a black edge making its pattern even more distinct.

The color of a juvenile’s scales is blue/green until the snake reaches a size of 30 inches. From there, the snake starts to take on the bright green scales of an adult.

This African snake has a long slender body measuring from 4.6 up to 8 feet. Its color and slender structure allow this snake to blend very well into its habitat in the trees. It curls around the branches and adeptly moves through the different levels of a tree. Sometimes this snake remains in the same tree for several days.

Their round eyes have yellowish-brown irises.

How to identify a western green mamba:

  • Bright green scales that fade to yellow toward its tapered tail
  • Its scales have black edges making the pattern stand out
  • It has yellow scales on its underside
  • A slender, long body perfect for grasping tree branches
  • Round eyes with a yellow-brown iris

Habitat

Western green mamba resting in tree

Western green mambas (D. viridis) often rest in trees, waiting for prey to wander too close.

The Western Green Mamba snake is found in much of western Africa, from Senegal to Chad and Cameroon. They prefer habitats with plenty of cover, such as dense forests, savannas, and woodlands. They are most often seen near water or around rocky hillsides, where they can hide among vegetation or rocks. During the day, they usually stay within 25 feet above ground levels and are known to climb up trees and other structures if needed.

At night they may venture further away from their daytime resting spots in search of food, such as rodents, birds, bats, and lizards which they swallow whole after killing them with their powerful venom. They are also able to cross short distances between branches by stretching out their bodies while maintaining balance using the prehensile tail that curves upwards at the end like a hook allowing them to grip objects firmly.

Diet

Western green mambas are bright green towards the head, shifting to yellow or orange at the tail.

Western green mambas eat lizards and birds out of trees.

Because they are arboreal snakes, they feed primarily on small birds and lizards like geckos. They hunt by using their keen sense of smell to detect prey, as well as their sharp vision in order to spot potential food sources before striking out with lightning speed. Their diet also consists of invertebrates such as spiders, scorpions, centipedes, frogs, and other amphibians. When hunting for larger prey items such as rodents or birds, they will use ambush tactics that involve waiting patiently until the target enters into range before quickly lunging forward and seizing it with their powerful jaws. In addition to these tactics, they may also occasionally scavenge corpses of animals that have already died due to natural causes or have been killed by other predators in the area.

Reproduction and Life Cycle

Eastern Green Mamba in a Tree

Western green mambas lay 6-15 eggs per clutch.

Western Green Mamba snakes reproduce through oviparity, meaning they lay eggs. They typically produce a clutch of 6-15 eggs in the late spring or early summer. The female will select a warm, dark location, such as under rocks or logs, to lay her eggs and provide protection from predators. After about two months, the young hatchlings emerge from their shells and are independent immediately after birth.

The Western Green Mamba reaches maturity at 2-3 years old and can live for up to 10 years in captivity if cared for properly. In the wild, however, these snakes usually only reach an age of 5 due to predation by larger animals like birds or mammals as well as humans hunting them for their skin which is highly desired for leather goods production.

Western Green Mamba Pictures

Western Green Mamba

Western green mambas (D. viridis) inhabit coastal rainforests in West Africa.

Western green mamba in a tree

Western green mambas enjoy hiding away in trees, out of sight from humans.

Western green mamba isolated

These snakes can measure up to 8 feet long.

Venom: How Dangerous Are They?

These snakes are dangerous with a potent, fast-acting venom. In fact, the venom begins to cause symptoms in someone who is bitten within about 15 minutes. The fast-acting nature of its venom has resulted in several fatalities.

But, keep in mind, they spend most of their lives high up in the trees. So, humans usually don’t see them, much less get bitten by one. Also, this species is considered a shy snake. You may have heard myths about the aggression of mamba snakes. There is even a myth that the black mamba will chase a human in an effort to give them a venomous bite! But factual information about this reptile shows the western green and the other species of mambas are most likely to try to escape when threatened.

The first step to take if bitten is to get to a hospital for antivenom. The bite wound should be snugly wrapped along with the upper part of the person’s affected arm or leg. Keeping the wounded limb as still as possible is an essential part of care in this situation.

Behavior and Humans

Beautiful Green Animals - green mamba

A Green mamba prefers to live a solitary and nocturnal life.

Western Green Mamba snakes are solitary and nocturnal, preferring to rest in tree hollows during the day. They become active at night, searching for prey such as small rodents, birds, lizards, and frogs. These snakes can be very aggressive if threatened and will use their venomous bite as a defensive mechanism. When in danger, they may coil up into a tight spiral with their heads raised off the ground to strike from a distance.

Western Green Mambas have excellent vision, which helps them locate potential prey even in dim light conditions. They also possess an acute sense of smell that allows them to track down food sources over long distances. In terms of communication, they rely on chemical signals released by body secretions or through vibrations produced by rubbing against objects such as branches or rocks. The Western Green Mamba is not known to actively seek out human interaction but will attack when provoked or disturbed in its natural habitat.

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Sources

  1. African Snakebite Institute / Accessed May 14, 2022
  2. Wikipedia / Accessed May 14, 2022
  3. IUCN / Accessed May 14, 2022
  4. Safaris Africana / Accessed May 14, 2022
  5. UCSD / Accessed May 14, 2022
  6. Reptile Database / Accessed May 14, 2022
  7. African Snakebite Institute / Accessed May 14, 2022
Heather Hall

About the Author

Heather Hall

Heather Hall is a writer at A-Z Animals, where her primary focus is on plants and animals. Heather has been writing and editing since 2012 and holds a Bachelor of Science in Horticulture. As a resident of the Pacific Northwest, Heather enjoys hiking, gardening, and trail running through the mountains with her dogs.

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Western Green Mamba FAQs (Frequently Asked Questions)

Yes, one of the first pieces of information to learn about this snake is it strikes quickly with fast-acting, strong venom.