4 Types of VENOMOUS Snakes in Guinea Bissau! (2024)

Do you want to learn about the types of venomous snakes in Guinea Bissau?

Types of venomous snakes in Guinea Bissau

If so, you have come to the right place. In the article below, I have listed the MOST COMMON venomous snakes you can expect to see. If I missed any, please leave a Comment at the bottom of the page. 🙂

You’ll see that the venomous snakes in Guinea Bissau are very different from each other. They have different sizes, habitats, and even different types of venom. In addition, certain snakes are common to find living around people. For each species, you will find out how to identify that snake correctly, along with pictures, interesting facts, and RANGE MAPS!

Venomous Snakes that Live in Guinea Bissau:


#1. Puff Adder

  • Bitis arietans

Also known as the African Puff Adder and Common Puff Adder.

Types of venomous snakes in Guinea Bissau

Identifying Characteristics:

  • Adults are 100-150 cm (39-59 in) long.
  • They are commonly gray to dusty brown, with yellow chevrons on their backs.
  • There are two dark bands on the head, one on the crown and one between the eyes.
  • Male Puff Adders are usually larger than females.

Puff Adders are one of the most dangerous venomous snakes in Guinea Bissau.

This ill-tempered native snake roams savannas, grasslands, and – to the great misfortune of inhabitants – densely populated areas. The Puff Adder gets its name from how it inflates itself when threatened. Instead of moving away, it will hiss a warning to intruders before inflating and striking.

Its distinctive yellow, white, and brown chevron pattern allows the Puff Adder to blend into its surroundings. This camouflage is particularly useful for its lifestyle as an ambush predator. Be careful where you wander because this highly-venomous, fast-striking snake seems to come out of nowhere.

The Puff Adder’s venom contains a cytotoxin that can kill a healthy adult human within a day. Their potent poison and tendency to loiter around footpaths make this snake one to avoid. Watch your step!


#2. Spotted Night Adder

  • Causus maculatus

Also known as Forest Rhombic Night Adders or West African Night Adders.

Types of venomous snakes in Guinea Bissau

Identifying Characteristics:

  • Adults are 30-71 cm (12-28 in) long.
  • They are small, thick, and have broad, rounded snouts.
  • Their coloring is brownish, but they may also be gray, olive, or light green with dark brown or black patches down their back.

You can find these venomous snakes in Guinea Bissau in nearly every habitat!

They occupy forests, savanna, and semi-desert. Across this wide range of habitats, we also see a range of coloration. Some individuals may have different patterns, and especially in arid regions, they may have no pattern at all.

Despite the name, Spotted Night Adders are active during the day and at night. They move across the landscape slowly but can strike with incredible speed. Even though they’re a terrestrial or ground-dwelling species, they will occasionally pursue a frog or toad into a shrub.

While venomous, Spotted Night Adders don’t pose a serious risk to humans. Bites generally result in relatively mild symptoms, including pain, swelling, and mild fever. Typically the symptoms disappear within three days, but you should still see a doctor if bitten.


#3. Western Green Mamba

  • Dendroaspis viridis

Types of venomous snakes in Guinea Bissau

Identifying Characteristics:

  • Adults are 1.5-2.5 m (5-8 ft) long.
  • They have slender bodies, long tapering tails, and round pupils with yellowish-green irises.
  • Their coloring is bright green, fading to yellow or orange toward the tail, and each scale has a prominent black margin giving the snake a webbed pattern.

Western Green Mambas are beautiful but deadly venomous snakes in Guinea Bissau!

They prefer to live in forested habitats where their intense coloring acts as camouflage. You might also find them in deforested areas, parklands, and suburbs with sufficient vegetation.

Although active during the day, these snakes can be tough to find. Western Green Mambas spend most of their time gracefully moving along branches in the high forest canopy. They sleep in densely leaved branches and hunt tree-dwelling rodents and birds.

They usually retreat when threatened, but you don’t want to disturb one. Western Green Mambas have extremely potent venom that contains neurotoxins, cardiotoxins, and other poisons. Symptoms include local pain, swelling, necrosis, headaches, dizziness, low blood pressure, and trouble breathing.

Without treatment, severe symptoms can progress rapidly and eventually result in paralysis of the respiratory muscles causing suffocation. Deaths within 30 minutes have been reported.


#4. Green Bush Viper

  • Atheris chlorechis

Also known as Western Bush Vipers or West African Leaf Vipers.

Types of venomous snakes in Guinea Bissau

Identifying Characteristics:

  • Adults are about 50 cm (20 in) long.
  • Their coloring is light green with a pale green underside and pairs of faint yellow spots running down their back about 2.5 cm (1 in) apart.
  • They have slender bodies, triangular heads, and intensely keeled scales.

Look for this venomous snake in Guinea Bissau in dense forests.

Green Bush Vipers spend most of their time in branches 0.9-1.8 m (3-6 ft) off the ground. Their coloring allows them to remain hidden amongst the foliage to avoid predators and ambush prey like rodents, lizards, and tree frogs.

While they’re not aggressive snakes, a bite from a Green Bush Viper can have serious consequences. Their venom can result in internal hemorrhaging and renal failure, which can be fatal if left untreated.


Did you know that snakes are considered venomous, NOT poisonous?

There currently is a common misconception between poisonous and venomous, one is ingested, and the other is injected. So, for example, If you eat something that makes you sick, then it is considered “poisonous.” But if an animal, like a snakes, delivers its toxins when it bites, then it’s considered “venomous.”


Learn more about animals found in Guinea Bissau in these ID Guides:


Which of these venomous snakes have you seen before in Guinea Bissau?

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