---
title: "black mamba vs green anaconda — size, speed and bite force"
description: "black mamba and green anaconda compared on mass, length, speed, bite force and lifespan — every measure side by side, with why the numbers cannot settle an encounter"
url: https://atoneplace.net/animal-vs/black-mamba-vs-green-anaconda/
site: "At One Place"
---

# black mamba vs green anaconda

**black mamba vs green anaconda: green anaconda leads on 2 of 3 measures**

Measured comparison — not a prediction

The fastest snake and Africa's longest venomous one; it is named for the black inside of its mouth, not its colour. The heaviest snake in the world, though the reticulated python grows longer. On the measurements below, green anaconda leads on more of them — but they do not all point the same way, and the ones that disagree are the interesting part.

## The measurements

|  | black mamba | green anaconda |
| --- | --- | --- |
| Mass | 1–3.1 kg | 30–227 kg |
| Length | 2–4.3 m | 3–8.8 m |
| Top speed | 11–20 km/h | — |
| Lifespan | 10–20 yr | 10–30 yr |

## Where each one leads

- Mass: green anaconda is 38× heavier.
- Length: green anaconda is 1.8× longer.
- Lifespan: black mamba is 1.1× a longer life.

## What this does and does not tell you

These are measured averages with real ranges behind them, and every figure links to its own page. What they cannot do is settle an encounter. Outcomes between animals turn on circumstance — who initiates, whether either is hungry, defending young, injured or cornered, and what the terrain favours. Size and bite force are not decisive on their own, and most of these pairs never meet in the wild in any case, because their ranges do not overlap.

> Every figure here is an average with a substantial spread. Individual animals vary enormously — a large individual of the smaller species routinely exceeds a small individual of the larger one.

## Common questions

### Is a black mamba bigger than a green anaconda?

green anaconda is heavier — 30–227 kg against 1–3.1 kg.

### Who would win, a black mamba or a green anaconda?

That is not something measurements can settle. The comparison above shows which animal leads on each measure, but an actual encounter depends on circumstance, motivation, health and terrain — and most pairs like this never meet in the wild.

## Related pages

- [How much does a black mamba weigh?](https://atoneplace.net/weight/black-mamba/)
- [How much does a green anaconda weigh?](https://atoneplace.net/weight/green-anaconda/)
- [cheetah vs green anaconda](https://atoneplace.net/animal-vs/cheetah-vs-green-anaconda/)
- [cougar vs green anaconda](https://atoneplace.net/animal-vs/cougar-vs-green-anaconda/)
- [domestic cat vs green anaconda](https://atoneplace.net/animal-vs/domestic-cat-vs-green-anaconda/)
- [gray wolf vs green anaconda](https://atoneplace.net/animal-vs/gray-wolf-vs-green-anaconda/)
- [coyote vs green anaconda](https://atoneplace.net/animal-vs/coyote-vs-green-anaconda/)
- [African elephant vs green anaconda](https://atoneplace.net/animal-vs/african-elephant-vs-green-anaconda/)
- [African elephant vs black mamba](https://atoneplace.net/animal-vs/african-elephant-vs-black-mamba/)
- [blue whale vs green anaconda](https://atoneplace.net/animal-vs/blue-whale-vs-green-anaconda/)
- [great white shark vs green anaconda](https://atoneplace.net/animal-vs/great-white-shark-vs-green-anaconda/)
- [bull shark vs green anaconda](https://atoneplace.net/animal-vs/bull-shark-vs-green-anaconda/)
- [great hammerhead vs green anaconda](https://atoneplace.net/animal-vs/great-hammerhead-vs-green-anaconda/)
- [American alligator vs green anaconda](https://atoneplace.net/animal-vs/american-alligator-vs-green-anaconda/)

## Sources

- Wikidata — Wikimedia Foundation (https://www.wikidata.org/) [CC0 1.0]
- Smithsonian National Museum of Natural History — Smithsonian Institution (https://naturalhistory.si.edu/)