Python vs Boa

Pythons and boas are both large, non-venomous constrictors that kill by tightening coils, so they are often mistaken for each other. They belong to separate families, Pythonidae and Boidae. Pythons live in Africa, Asia and Australia. Boas are found mainly in the Americas, with some species in Africa, Asia and Pacific islands.

Size is not a clean separator. Pythons span from pygmy species around 23 inches to reticulated pythons near 33 feet, and boas span from 16-inch sand boas to anacondas of about 30 feet. Anacondas are boas, which surprises many people. Reproduction and range are better clues than length.

Python vs Boa side by side

Last verified October 2026. Typical values; individual animals, products and local prices vary.

When you are looking at which

Python

• The female is coiled around a clutch of eggs, or the snake was hatched from an egg.
• It is native to Africa, Asia or Australia, and the label says ball, Burmese, reticulated or carpet python.
• You can see pits along the lip scales, small dents along the jaw line.
• Reptile keepers describe it as a python, and the largest examples come from Asia.

Boa

• The female gave birth to live, fully formed young, sometimes wrapped in a membrane.
• It is native to Central or South America, and the label says boa constrictor, rainbow boa or anaconda.
• It is an anaconda, which is a boa despite the different name.
• Any pits are located between scales rather than on lip scales.

How this works

The quiz asks about reproduction, range, jaw pits, common name and maximum size. Each answer favors the family most associated with that cue, and the note under each question names both so you can see the reasoning, including which cues are weaker or overlap.

The result is a field guide, not a lab test, and each cue is explained in the note under its question. Trade names can be loose and some boa species live outside the Americas, so confirm any uncertain animal with a herpetologist or a reptile veterinarian before you rely on the result.

Where these numbers come from

The figures and defaults on this page are based on:

• San Diego Zoo Wildlife Alliance: Python, Python size range, eggs, heat pits, habitat and range. (checked October 2026)
• San Diego Zoo Wildlife Alliance: Boa, Boa live birth, size range, range and diet. (checked October 2026)
• Wikipedia: Boidae, Boa family traits, teeth, pit placement and anaconda. (checked October 2026)
• Wikipedia: Pythonidae, Python family range, egg brooding, pits and premaxillary teeth. (checked October 2026)

Field-identification guide. Large constrictors need experienced handling, and local laws on keeping them vary.