How Fast Is a Black Mamba? Speed Facts vs Myths

Black mamba speed in numbers

The black mamba (Dendroaspis polylepis) of sub-Saharan Africa has a fearsome reputation for speed. When scientists and naturalists talk about real figures, three numbers come up again and again.

For comparison, an adult walks at about 5 km/h (3 mph), and a recreational jogger runs at roughly 8–10 km/h (5–6 mph). An elite sprinter can briefly pass 40 km/h (25 mph), and a galloping horse reaches around 40–48 km/h (25–30 mph). Even the most generous estimates for the black mamba come nowhere near those speeds.

How is the speed of a snake measured?

Measuring a snake’s top speed is harder than it sounds. A snake does not run along a straight track on command, and a wild black mamba is not an animal anyone wants to chase with a stopwatch. Most figures come from timing a snake as it crosses a known distance, from film, or from careful field observations.

Several factors make the results vary:

• Temperature. Snakes are ectotherms, meaning their body temperature depends on their surroundings. A warm snake can move much faster than a cool one.
• Surface. Snakes push against rough ground, stones and plant stems. On smooth, bare surfaces they lose grip and slow down; in grass and scrub they can move more efficiently.
• Distance. Like many reptiles, snakes rely heavily on anaerobic muscle power for sprints and tire quickly. A burst over a few meters is faster than anything they can keep up for long.
• Motivation. A snake fleeing danger moves faster than one simply traveling or hunting.

Because so few snakes have been timed under comparable conditions, no one can say with full confidence which species is the fastest. The black mamba is a strong candidate, but its title is based on a small number of measurements.

Why black mambas seem so fast

Several features make the black mamba look even faster than it is. It is long, usually 2–3 m (6.6–9.8 ft), so each wave of its body covers a lot of ground. It often travels with its head and the front part of its body raised well off the ground, which gives it a striking, upright posture.

It is also extremely alert. In the wild, black mambas usually slip away when a person is still about 40 m (130 ft) off, and the sudden disappearance of a large snake into brush or a burrow can feel like an explosion of speed. It is a skilled climber, too, and can move up into trees and shrubs quickly.

The way snakes move without legs adds to the impression. The mamba mainly uses lateral undulation, the familiar S-shaped movement in which the body pushes sideways against the ground and objects. To learn how this and other methods work, see How do snakes move without legs?

Speed of travel vs speed of strike

Travel speed and strike speed are two different things. A black mamba’s strike, like that of many snakes, is a fast lunge of the head and front of the body that takes only a fraction of a second. A defensive mamba can deliver several strikes in quick succession and can reach a long way, because it can raise a large part of its body off the ground.

This is the real reason to keep your distance. A person cannot dodge a strike at close range, no matter how slowly the snake travels across open ground.

Myths about black mamba speed

Myth: a black mamba can outrun a galloping horse. This old story appears in many travel books and campfire tales. No measurement comes close: a horse is several times faster than even the highest estimate for a mamba.

Myth: black mambas chase people. Black mambas avoid people. When one does move toward a person, it is usually heading for a burrow, termite mound or other shelter that happens to lie behind them. Stepping aside and leaving a clear route almost always ends the encounter.

Myth: you can never escape a mamba. A healthy adult walking calmly away can easily stay out of range. Panic, sudden movements and attempts to kill or catch the snake are what lead to bites.

Myth: the black mamba is by far the fastest snake. Few snakes have been timed. Some North American and African racers and whip snakes are also fast, and without comparable data the “fastest snake” label is a reasonable claim, not a record.

How the black mamba uses its speed

In daily life, the black mamba uses speed for two jobs. When hunting, it moves quickly through grass and over rocks to reach rodents, hyraxes and birds, then strikes and lets the venom work while the prey runs a short distance. Speed lets it follow and find the prey soon afterward.

Its second use is escape. Black mambas have few predators as adults, but eagles, mongooses and honey badgers do attack them, and people kill many out of fear. A quick dash to a secure lair is the snake’s preferred way to stay safe, far more often than a threat display.

Staying safe around black mambas

Speed is not what makes encounters dangerous; closeness is. If you see a large snake in Africa, stop, step back slowly and give it several meters of space and a clear path to retreat. Never try to catch, corner or kill it, and watch where you step and put your hands in long grass and around rocks.

If anyone is bitten by any snake, seek emergency medical help immediately: call 911 in the US, 112 in the EU or 999 in the UK, or the local emergency number. For the real risks of black mamba venom, read Is the black mamba the deadliest snake?