Discover the Largest Boa Constrictor Ever Caught

largest boa constrictor

Written by Brandi Allred

Updated: November 20, 2023

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We’ve all heard of boa constrictors. We’ve also heard of pythons and anacondas, two other massive snakes. But, would you believe that there are actually at least ten different subspecies colloquially known as boa constrictors? Like ball pythons and corn snakes, the boa has not escaped the notice of snake enthusiasts looking for a pet. The most common species of pet boa constrictor are the boa constrictor and the boa constrictor imperator. But, neither of these snakes is the largest boa ever caught.

Here, we’ll take a look at the gargantuan snake we call the boa constrictor. We’ll start by learning more about the species in general, then move on to the boa’s lifecycle and diet. After we’ve learned more about the boa, we’ll dive into just how big they really get. Then, we’ll examine the largest boa ever caught. Finally, we’ll compare boas to anacondas and pythons and see how each of these giants measures up. Then, we’ll go over whether these giants make good pets.

Boa constrictors kill their prey using constriction, which is the process of the snake wrapping its muscular body around the prey and squeezing so that the animal cannot breathe.

Species Profile: Boa Constrictor

What Do Boa Constrictors Eat - Boa on Tree

Boa constrictors are famous zoo animals; their large size and placid nature make them ideal for viewing.

©Jan Hejda/

Boa constrictors come from Central and South America, reigning supreme as the largest snakes around. They have large, long heads with distinct dark markings on the top of the head and around the eyes. They’re light brown to tan, with darker brown or reddish hourglass markings along their back and sides. Many pet boas exhibit even more distinct coloring and patterning due to selective breeding.

Locally, boas prefer to stay close to permanent water sources, like rivers, streams, and wetlands. They’re good swimmers and spend much of their lives in water. But, they can also climb and are sometimes found high in the trees. Wherever they live, they tend to prefer warm, humid air.

Life Cycle

Like many snakes, boa constrictors give birth to live young rather than lay eggs. Females gestate their young for 100-120 days before giving birth to an average of 25 snakelets (though some older females may have as many as 60). The young start life around 1 foot long and continue to grow throughout their lives. Even the largest boas ever caught started life as tiny newborns. Boas are considered adults by the time they’re 3-4 years old.


Many people assume that all snakes have vicious fangs at the ready. However, boa constrictors only have small, hooked teeth they utilize to hang onto prey as they slowly constrict them to death. An interesting fact is that, if the teeth fall out for some reason, they will grow back. The jaws of boa constrictors are also specialized to open astonishingly wide in order to swallow large prey.


As you might have guessed, boa constrictors kill their prey using constriction. Constriction refers to the process of the snake wrapping its muscular body around the prey and squeezing so that the animal cannot breathe. This results in a quick death, after which the boa is free to swallow the prey whole. Boas eat mostly small to medium-sized mammals, birds, and reptiles. The bigger the boa, the larger the prey it can consume.

How Big Do Boas Get?

Biggest Snakes: The Boa Constrictor

Boa constrictors are one of the largest snakes on Earth.


Even at birth, boa constrictors are not small. They range from one to two feet long as brand-new snakelets, though they grow rapidly in the first four years of life. By the time they’re a year old, they measure between three and four feet long. At three years old, boas measure between six and 10 feet on average. They’re considered adults by the time they turn five. After five, their growth slows but never stops entirely.

The largest boas can grow up to 12 feet long, though there are reports of even bigger boas. Their weight depends heavily on the subspecies but ranges from 10 pounds to over 30 pounds. Female boas are bigger and usually heavier than males.

The Largest Boa Constrictor Ever Caught

Best Pet Snake option - boa constrictor

Boa constrictors may seem huge, but there are even bigger snakes like the reticulated python out there.

©Natalia Kuzmina/

According to National Geographic, the largest boa constrictor ever caught measured 18 feet long, though no citation exists for this specimen. So, while it is safe to say that the largest boas grow to at least 10 and even 12 feet long, reports of longer snakes are dubious. 

Anaconda vs. Boa

Boa constrictors are no small fries, but they’re still dwarfed in size by the anaconda. Where boas grow to around 12 feet at maximum, anacondas can reach lengths of 15 feet or more. However, in both types of snakes, females are bigger than males. This means that a large female boa is likely to be larger than a large male anaconda. 

Both of these serpents hunt by ambushing their prey. If they are in a particular area with not much ground cover to hide in, they will adjust their busy schedules to hunt at night. Those are some big bodies to hide at night!

But what about green anacondas? Green anacondas are one of the largest snakes on the planet. They far outsize even the largest boa constrictor ever caught. The biggest green anacondas can grow to over 20 feet long and weigh hundreds of pounds.

What Do Anacondas Eat - Pet Anaconda

Green anacondas are the largest snakes in the world.

©Holger Kirk/

Python vs. Boa

Once again, the boa constrictor’s bulk is put to shame by the much larger and longer reticulated python. Reticulated pythons are the largest snakes in the world and can measure over 20 feet long. Like boa constrictors, pythons are non-venomous constrictors and rely on their bulk to kill prey. Reports of pythons reaching lengths of more than 30 feet are greatly exaggerated, and no known specimen of this size has ever been reliably measured.

One special feature about both of these is that they both have a pair of lungs, whereas most snakes only have one lung.

Despite their enormous size, pythons are a little more shy than boas. They also tend to be more still and docile when being held.

Do Boa Constrictors Make Good Pets?

Pet Snakes - Boa Constrictor

Boa constrictors may not be the right choice for beginner snake owners.

©New Africa/

You don’t have to see the largest boa constrictor ever caught to want a boa of your own. Boas are largely regarded as low maintenance, friendly, and safe to keep as pets. But their tremendous size (generally up to seven feet for captive snakes) means that only those with the proper space should consider getting a pet boa.

If you’re thinking of adding a boa to your family, check state and federal regulations first. Boas, and other snakes, aren’t legal to keep in every state.

How Long Do Boa Constrictors Live?

Boa constrictors can live for about 20 -30 years

©Sanne Romijn Fotografie/

On average, they live pretty long compared to the average snake. Boa constrictors live for anywhere between 20 and 30 years. There have even been reports of them living for as long as 40 years.

This is pretty impressive in light of the fact that most snakes tend to live for just under a decade with notable exceptions including pythons or copperheads living for 20 years and 18 years, respectively.

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About the Author

Brandi is a professional writer by day and a fiction writer by night. Her nonfiction work focuses on animals, nature, and conservation. She holds degrees in English and Anthropology, and spends her free time writing horror, scifi, and fantasy stories.

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