Are Boa Constrictors Poisonous?

No, boa constrictors are not poisonous or venomous. They are non venomous constricting snakes that subdue their prey by squeezing rather than by injecting venom. This is one of the reasons they have become popular pets around the world. However, there are still some important things to understand about how boas catch their food and what a bite from one actually involves.

Poisonous vs. Venomous: A Quick Clarification

Before going further, it is worth clearing up a common confusion. “Poisonous” and “venomous” are not the same thing. Poison is something that harms you when you eat, touch, or inhale it. Venom is something that is injected into you through a bite or sting. Snakes that are dangerous because of their bite are venomous, not poisonous.

Boa constrictors are neither poisonous nor venomous. They do not produce any toxins at all. They are pure constrictors that rely entirely on physical strength to catch and kill their prey.

How Boa Constrictors Kill Their Prey

Instead of venom, boa constrictors use constriction. When a boa strikes at prey, it grabs hold with its teeth and immediately wraps coils of its muscular body around the animal. Each time the prey exhales, the boa tightens its coils slightly, preventing the animal from taking another full breath.

Recent research has shown that constriction may also work by cutting off blood flow to vital organs rather than simply suffocating the prey. The immense pressure from the boa’s coils can cause a rapid drop in blood pressure and cardiac arrest, which may actually kill the prey faster than suffocation alone.

Once the prey stops moving, the boa swallows it whole, starting with the head. Their flexible jaws allow them to consume prey items significantly larger than their own head.

What Happens If a Boa Constrictor Bites You

While boa constrictors are not venomous, they do have teeth and they can bite. A boa constrictor has rows of small, recurved (backward facing) teeth designed for gripping prey. A bite from a boa constrictor will leave puncture wounds and may bleed, but there is no venom to worry about.

The severity of a bite depends on the size of the snake. A bite from a baby boa feels like a quick scratch. A bite from a large adult (8 to 10 feet) is more significant and can leave deeper puncture marks, but it is still not medically dangerous in the way a venomous snake bite would be.

If you are bitten by a boa constrictor, clean the wound thoroughly with soap and water and apply antiseptic. Watch for signs of infection over the next few days. Snake mouths can harbor bacteria, so keeping the wound clean is important.

Are Boa Constrictors Dangerous

While not venomous, large boa constrictors are powerful animals that deserve respect. An adult boa constrictor can reach 6 to 10 feet in length and weigh 30 to 60 pounds. Their constriction strength is significant, and incidents involving large boas can be serious if the snake wraps around a person’s neck or chest.

However, bites and constriction incidents with captive boas are rare and almost always the result of feeding errors (the snake mistaking a hand for food) or improper handling. Well socialized, captive bred boas are generally calm and predictable animals that rarely show aggression toward their owners.

As a safety rule, anyone keeping a boa constrictor over 6 feet should never handle the snake alone. Having a second person present ensures that if the snake does wrap around you unexpectedly, someone is there to help unwrap it. For more about snake species that make good pets, see our guide to popular pet snake breeds.