Reptiles
Black Mamba
Dendroaspis polylepis · also called black-mouthed mamba
The black mamba is the snake at the centre of more African folklore, fear, and exaggeration than any other. Strip away the myths and what is left is still formidable: the longest venomous snake in Africa, one of the fastest snakes anywhere, and the owner of a venom that works fast.
Overview
Black mambas live across sub-Saharan Africa in dry, open habitats — savanna, scrubland, rocky outcrops, and light woodland. They shelter in termite mounds, hollow trees, abandoned burrows, and rock crevices, often returning to the same lair for years. Unlike the green mambas, which are arboreal, the black mamba spends most of its time on or near the ground.
Physical characteristics
An adult is typically 2–3 m long, occasionally reaching 4.5 m, with a slender body, a narrow “coffin-shaped” head, and smooth scales in shades of grey, gunmetal, or olive-brown — never black. The name refers to the interior of the mouth, which is a deep blue-black and is displayed in the snake’s threat posture: body raised, a slim hood flared, mouth held open.
The eyes are medium-sized with round pupils, and the snake has good daytime vision and a keen sense of smell, flicking its forked tongue to track prey and detect threats.
Speed and hunting
The black mamba’s famous speed is real but often misunderstood. Over short, level stretches it can move at 12–19 km/h with its head and forebody lifted clear of the ground — impressive for a legless animal, but slower than a person can sprint. It uses this to reach cover, not to run anything down.
Hunting is a mix of ambush and active foraging. The mamba targets small warm-blooded prey — rats, mice, hyraxes, bushbabies, and birds — striking once or twice to inject venom, releasing the animal, and then tracking it by scent until it collapses. It swallows prey whole and, being cold-blooded, may not need to feed again for days or weeks.
Venom
Black mamba venom contains dendrotoxins, which block the signals between nerves and muscles, alongside cardiotoxins that affect the heart. Bites can produce a metallic taste, drooping eyelids, and tingling within ten minutes, progressing to difficulty swallowing and breathing and, without treatment, respiratory failure. The danger comes from the speed of onset, the potential dose, and the snake’s willingness to bite repeatedly when it feels it has no other option.
Effective antivenom exists, and outcomes are good where it can be reached quickly. Most bites in practice happen to people working in fields or handling snakes, not to hikers.
Reproduction
Males compete for females in the spring breeding season with a wrestling contest — bodies intertwined and raised, each trying to force the other’s head down, without biting. The female lays 6 to 17 eggs in a warm, humid hollow and does not guard them. Hatchlings are about 50 cm long and fully venomous immediately.
Conservation
The black mamba is listed as Least Concern. It is widespread, adaptable, and reproduces well, and it faces no major population threat beyond localised habitat loss and the many snakes killed on sight near settlements. Snake-rescue and relocation services in parts of southern Africa now remove mambas from homes and farms rather than killing them.
Black Mamba: common questions
Why is it called a black mamba if it isn't black?
The body is usually grey, olive, or greyish-brown, never truly black. The name comes from the inside of the mouth, which is ink-black. A threatened black mamba flattens a narrow hood and gapes widely, showing that dark mouth as a warning before it strikes.
How fast can a black mamba move?
In short bursts on open ground it can reach 12 to 19 km/h, holding its head and the front third of its body well off the ground. That is fast for a snake but slower than a running human — the mamba uses its speed to escape to a bolt-hole, not to chase people down.
How dangerous is a black mamba bite?
Very. The venom is a potent mix of neurotoxins and cardiotoxins that acts quickly, and a mamba may inject a large dose and bite more than once. Before antivenom, an untreated bite to the torso was close to always fatal, sometimes within a few hours. With prompt antivenom and hospital care, survival is the norm.
Is the black mamba aggressive?
No — its fearsome reputation is mostly about what happens when things go wrong. A black mamba's first response to a human is almost always to flee to cover. It becomes dangerous when it is cornered, trodden on, or cut off from its escape route, at which point it defends itself decisively.