Meet the Deadliest Snake in the Americas

Key Points:

  • The fer-de-lance, a venomous pit viper native to multiple countries in South America, is the deadliest snake in the Americas.
  • The fer-de-lance has a hemotoxic venom that damages muscle tissue and breaks down proteins in the affected area. Humans bitten by this snake can suffer extreme pain, internal bleeding, impaired consciousness, sepsis, and necrosis of local tissues even with treatment.
  • Because they can react quickly when threatened, and utilize a fake retreat tactic that takes predators and humans off guard, fer-de-lance snakes have even managed to kill herpetologists that have tried to catch them.

The Americas are home to many deadly creatures. From grizzly bears and jaguars to venomous snakes, many of these native animals can be dangerous to humans. However, some species of animal are deadlier than others, especially where snakes are concerned. That’s why we’re going to spend some time looking at the deadliest snake in the Americas. This creature goes by a lot of names, and you’ll learn them all before we’re done talking about this snake. Without further ado, let’s get to know the fer-de-lance.

What is the Deadliest Snake in the Americas?

Fer-de-lance snake in the jungles of Costa Rica
Fer-de-lance is easily recognized by the shape of its head.

©Jim Cumming/

The fer-de-lance is the deadliest snake in the Americas, and it earned that title for its potent venom and willingness to bite when cornered. This pit viper is also known to be unpredictable. In some cases, it will appear to retreat, only to turn around and bite the encroaching animal or human.  

The fer-de-lance goes by a lot of different names. The binomial designation for this creature is Bothrops asper, but it also goes by terciopelo. The name fer-de-lance refers to the snake’s head shape that resembles the end of a lance. The head is thick and angled to a point at the creature’s mouth area.

For that reason, many English-speakers will call this snake a lancehead even though that term applies to a lot of different creatures from the Bothrops family.

The name terciopelo means “velvet” in Spanish, and that name is one of many other interesting monikers for this snake. You’ll know the fer-de-lance by its large, broad, and flat head that is usually wider than the rest of its body. The snake’s head can be darker than its body, ranging from black to lighter shades of brown with the yellow from the animal’s underbelly appearing up to and around its eyes.

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The snake has light and dark patterns across its body that are roughly triangular in shape. Mixed into the brown on their bodies are gray, olive, and black colors. The snakes are far from uniform, but they’re easily identifiable. Now that we know what the snake looks like, it’s time to consider how dangerous this creature can be.

What Makes Fer-de-Lance the Deadliest Snake in the Americas?

Most Venomous Snakes - Russell's Viper
The fer-de-lance has a very powerful hemotoxic venom.


The fer-de-lance has a very potent venom that it uses to kill its prey. Unfortunately, that venom is just as potent against human beings as well. They have a hemotoxic venom that causes damage to the muscle tissue and breaks down proteins in the affected area.

Humans that are bitten by the fer-de-lance typically suffer from a great deal of pain at the bite site, internal bleeding, impaired consciousness, sepsis, and necrosis of local tissues even with treatment. These snakes are known for injecting a very large load of venom into their victims. The average bite yields about 458mg, and that is more than enough to kill a human being.

Death is a major concern from the snake’s venom, but tissue damage is as well. Many individuals lose their limbs to amputations after they are envenomated by the snake.

All in all, the snake’s venom is potentially lethal, but it also leaves many people disabled.

How Long Do They Live?

So we know how deadly these snakes are, but how long do they live? We know that reptiles tend to live longer than mammals of similar sizes. The cells inside their bodies seem to not deteriorate or show the same signs of aging as other animals.

For this particular serpent, it’s hard to determine their lifespan because they are so reclusive in the wild. It is estimated that they live over 20 years. In captivity, this number is lower, which is typical of animals not in their native environment.

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Where Does the Deadliest Snake in the Americas Live?

The fer-de-lance is home in many environments, including the rainforest.


The fer-de-lance is listed as one of the deadliest snakes in a variety of countries in Central America and South America. The snake can be found in many countries including:

  • Honduras
  • Mexico
  • Costa Rica
  • Ecuador
  • Venezuela
  • Panama
  • Belize
  • Colombia
  • Nicaragua

The snakes can be found in lowlands as well as moderate elevations. They’re comfortable in a variety of biomes. You can find them in grasslands, rainforests, coastal areas, farmlands, and some mountainous areas.

The fer-de-lance lives in the wild as well as near human settlements, hunting a variety of creatures and even scavenging when it needs extra food.

Fer-de-lance snakes are nocturnal creatures, going out at sundown to hunt along trails or roads. During the day, they spend their time coiled up in vegetation. While one may think they can avoid this dangerous snake if staying indoors at night, in Costa Rica alone, 550 people a year end up in hospital emergency rooms due to fer-de-lance snake bites.

One species of the Bothrops family is well-known throughout the world for living alone on an island in South America. The Bothrops Insularis, the golden lancehead, is related to the fer-de-lance. This snake’s entire species is trapped on Ilha da Queimada Grande, also known as snake island.

This island is so densely packed with these deadly and endangered snakes that the entire area is closed to the public. Some estimates, probably embellished ones, say that there is one snake for 10 square feet on the island. Either way, this island is a place to avoid.  

How Long do Fer-De_Lances Live?

This super deadly snake has a pretty long lifespan. The Fer-De-Lance typically lives between 15 and 21 years. Animals in the wild usually live longer than those in captivity.

Reptiles tend to live longer than mammals of the same or similar size. Some scientists have found that their bodies’ cells do not show the same signs of aging as other animals.

What Other Factors Make the Fer-De-Lance So Deadly?

The fer-de-lance is fast and unpredictable making it incredibly dangerous.

©David Havel/

The potency of the fer-de-lance’s venom is one factor that makes them deadlier than the average venomous snake. Another issue that we have already mentioned is their behavior. They will often feign retreat before turning around to bite their larger foe.

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This fake retreat allows the enemy to get within biting distance and then all but ensures a bite while leaving an avenue for escape.

Another complication stemming from these snakes is their speed. While they are not as fast as a sidewinder, they can move and react faster than humans. They have managed to kill herpetologists that have tried to catch them using the fake retreat method along with their great speed.

Lastly, fer-de-lances tend to live near human settlements in many countries. As the “Big 4” from India proves, putting too many people near venomous snakes greatly increases the chances of medically significant bites.  

One study found that the average mortality of all snakebites in Nicaragua was about 25%, and most of the venomous snakebites that occurred in that country came from the fer-de-lance. This demonstrates the power of the snake’s venom and shows how, in an area with plenty of venomous snakes, the fer-de-lance stands out among the others.

In other countries, like Colombia and Venezuela, the fer-de-lance also represents a large number of medically significant snakebites. Fortunately, widespread development and distribution of snake antivenoms are decreasing the number of people that die as a result of this snake’s bite.

Nevertheless, the fer-de-lance is the most dangerous snake in the Americas. It causes more deaths and has deadlier venom than any other snake in this hemisphere!

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