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Science & Nature • Reptiles

Boa constrictor

The boa constrictor is a large, nonvenomous snake in the boa family, Boidae.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

The boa constrictor is a large, nonvenomous snake in the boa family, Boidae. It is native to the Americas, with a range extending from northern Mexico through Central and South America. The species is known for its heavy body, variable patterning, and hunting by constriction.

Description

Boa constrictors are thick-bodied snakes with highly variable colour patterns. They are known for their size, heavy build, and method of capturing prey by coiling around it.

Distribution and habitat

The species ranges from northern Mexico through much of Central and South America. It lives in tropical rainforests as well as drier habitats such as savannas, scrublands, and agricultural areas.

Behaviour and diet

Boa constrictors are ambush predators that eat mammals and birds, swallowing prey whole after constricting it. They are generally solitary and can go long periods between meals.

Reproduction

Boa constrictors are viviparous, meaning they give birth to live young rather than laying eggs. Litters can be large, with reports of up to around 60 young.

Relationship with humans

Boa constrictors are frequently kept in captivity and are also affected by habitat change and collection for the pet trade. Their conservation status can vary by population and subspecies.

Key facts

  • Boa constrictors are nonvenomous snakes that subdue prey by constriction.
  • They are one of the largest snakes native to the Americas.
  • Their adult size is usually about 3 metres, though larger individuals have been reported.
  • The species has a wide natural range across Central and South America and parts of Mexico.
  • Boa constrictors occupy a variety of habitats, including forests, savannas, scrublands, and cultivated areas.
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Canadian context

Boa constrictors are of interest to Canadian readers mainly through the exotic pet trade, zoological collections, and wildlife education. They are not native to Canada.

Frequently asked questions

Is the boa constrictor venomous?
No. Boa constrictors are nonvenomous and kill prey by constriction.
Where do boa constrictors live?
They are native to northern Mexico, Central America, and much of South America, including a wide range of tropical and semi-arid habitats.
How big do boa constrictors get?
Adults are typically about 3 metres long, though some individuals grow larger.
What do boa constrictors eat?
They mainly eat mammals and birds, which they ambush and swallow whole after constricting.
Do boa constrictors lay eggs?
No. They give birth to live young.
How long do boa constrictors live?
They commonly live about 20 to 30 years, with some living longer in captivity.

References

  1. Encyclopaedia Britannica — https://www.britannica.com/animal/boa-constrictor
    Supports: Species identity, size, range, and habitat
  2. Smithsonian's National Zoo — https://www.nationalzoo.si.edu/animals/boa-constrictor
    Supports: Distribution, habitat breadth, constriction, and CITES listing
  3. National Geographic — https://www.nationalgeographic.com/animals/reptiles/facts/boa-constrictor
    Supports: Lifespan, reproduction, diet, size, and general natural history
  4. Animal Diversity Web — https://animaldiversity.org/accounts/Boa_constrictor/
    Supports: Range, habitat, diet, and ecological role
  5. Florida Museum of Natural History — https://www.floridamuseum.ufl.edu/florida-snake-id/snake/boa-constrictor/
    Supports: Non-native established population details and subspecies note