Reptiles
Mamba
Dendroaspis · also called mambas
The mamba is Africa’s most feared snake, and most of the fear is exaggerated. It cannot chase you, it is not black, and it would far rather flee than fight. What is true is that a mamba is fast, nervous, and armed with a venom that acts quicker than almost any other snake’s — so a bite is a real emergency, even though survival is now the usual outcome.
Overview
Mambas are the genus Dendroaspis, just four species — the black mamba of savanna and rocky hills, and three green mambas of forest and thicket, all in sub-Saharan Africa. They are slender, large-eyed, alert elapids — cobra relatives — with a coffin-shaped head, fixed front fangs, and fast-acting neurotoxic venom. They hunt birds and small mammals.
The myths, corrected
The black mamba is grey or olive; the name comes from the ink-black inside of its mouth, which it gapes open as a warning. It is fast for a snake — about 11 to 19 km/h in a dash — but that is a jog, and it uses the speed to reach cover, never to pursue a person.
The venom
Mamba venom is mostly fast neurotoxins. An untreated serious black mamba bite could cause collapse within 45 minutes and death within hours — among the quickest of any snake — but antivenom and breathing support make survival routine where care is available. The venom also contains mambalgins, painkilling proteins now studied as a possible morphine alternative.
Status
Mambas as a genus are Not Evaluated. All four remain widespread and reasonably common across sub-Saharan Africa, with none listed as threatened, though forest green mambas lose habitat locally, mambas are killed on sight near people, and some are taken for the pet trade.
Mamba: common questions
How dangerous is a black mamba bite?
Extremely dangerous if untreated, and a genuine medical emergency, but very survivable with prompt care. A black mamba can deliver a large dose of fast-acting neurotoxic venom, and historically an untreated serious bite was almost always fatal, often within a few hours, from paralysis of the muscles used for breathing. Modern treatment with antivenom and mechanical ventilation has changed that, and most bite victims who reach a hospital in time recover. The practical problem is that mambas live in rural parts of Africa where hospitals and antivenom can be far away, so the priority in a bite is to keep the person still and calm, immobilise the limb, and get to medical help as fast as possible.
Can a mamba really chase a person?
No. This is the most persistent myth about the black mamba. A mamba is fast for a snake, reaching perhaps 11 to 19 kilometres an hour in a short dash, which is a slow jog for a person and far slower than a running human. It uses that speed to reach cover, not to pursue. A mamba that appears to be coming toward someone is almost always trying to get past them to a known refuge such as a burrow or termite mound, and the person happens to be between it and safety. The correct response is to stand still or move sideways and give the snake a clear route away.
What is the difference between a mamba and a cobra?
They are both African elapids, the family with short fixed front fangs and mainly neurotoxic venom, and they are fairly close relatives. Mambas are more slender, longer-tailed, larger-eyed, and generally faster and more arboreal than cobras, and they cannot spread a true hood, though the black mamba flattens its neck slightly and gapes to show its black mouth. Cobras are stouter, spread a proper hood by swinging out neck ribs, and several species can spit venom, which no mamba does. In behaviour, mambas are nervier and quicker to flee, while a cornered cobra is more likely to stand its ground and hood.
Are green mambas as dangerous as the black mamba?
They are venomous and a bite is serious, but green mambas are considered less dangerous than the black mamba in practice. Their venom is potent and neurotoxic, but they deliver smaller amounts, they are more secretive tree snakes that people encounter far less often, and they are even more inclined to flee. Recorded deaths from green mambas are rare. The eastern green mamba in particular is a shy canopy hunter of coastal forest and dense gardens, and most bites involve someone reaching into foliage or handling the snake. All mamba bites should still be treated as emergencies.