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In Florida, The Giant Snail Is Back With Force: The African Giant Snail, An Invasive Species With 12 Thousand Teeth, Has Already Caused Millions In Damages And Is A Concern Due To Carrying A Parasite In The Brain.
The African giant snail is haunting Florida again. After three major outbreaks in just 60 years, this invasive species has forced authorities to spend more than US$ 40 million on eradication campaigns, quarantines of entire neighborhoods, and tons of poison. With over 12 thousand teeth, capable of devouring crops, paint, mortar, and even concrete, the snail is also a vector for a parasite that can attack the human brain.
Meanwhile, in other countries, it is farmed, eaten, transformed into cosmetics, and even used to monitor pollution. The same species that causes panic and quarantine in Florida is a source of income in parts of Africa and Asia. At the center of this story is always the same protagonist: the giant snail, discreet in appearance and devastating in impact.
What Is The Giant Snail African Giant Snail?
The so-called African giant snail is a terrestrial mollusk that, in its adult phase, can reach the size of a human hand, with 20 to 30 centimeters in length and weight greater than that of a large apple.
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Its tall, spiral shell is extremely resistant and rich in heavy metals, and some record-breaking individuals reach up to 40 centimeters and nearly 1 kilogram.
The main weapon of the giant snail lies within its mouth: a “file” with over 12 thousand microscopic teeth, a number four times greater than that of a shark.
With this structure, it scrapes leaves, bark, wood, paint, and practically any surface with organic matter or calcium.
Although it originated in East Africa, the giant snail has invaded more than 50 countries across four continents, including the Amazon rainforest, riverine communities in Asia, suburbs of Tokyo, and many residential areas in Florida.
While it may resemble a common snail, it is the only known invasive species capable of eating concrete and carrying a dangerous set of parasites.
How The Giant Snail Got To Florida
The story of Florida with the giant snail is a sequence of human errors. The first outbreak started in the 1960s, when children in Miami kept three snails as pets.
They reproduced quickly and ended up released into the environment. Soon after, authorities were facing 18 thousand snails and enough eggs to cover a basketball court.
It took 10 years and about US$ 1 million (equivalent to about US$ 10 to 11 million in current values) to eradicate this first invasion.
After that, the government tightened the rules. The Department of Agriculture started to prohibit the import, breeding, and trade of the giant snail, with fines of up to US$ 250 thousand and up to five years in prison. It seemed like the end of the problem. It wasn’t.
Between 2010 and 2011, Florida experienced a second outbreak, much worse. A religious group brought snails illegally from Nigeria for rituals, while others arrived hidden in planes and shipments.
In six years of campaigning, the state destroyed 160 thousand snails, nearly nine times more than in the first invasion, at a cost of over US$ 26 million. And again, declared the species eradicated.
In 2022, the giant snail reappeared, this time in Pasco County. The investigation pointed to a persistent vector: the black market, with eggs sold online for around US$ 100 per package of 10 units and adult pairs reaching US$ 300–500.
Even with the ban in effect since 2014, smugglers continue bringing the species. Today, experts agree on one point: the giant snail has not disappeared, it has just hidden in trees, pipes, and underground, waiting for the next rainy season.
How The Giant Snail Devours Crops, Houses, And Infrastructure
The giant snail is not just a threat to agriculture. It is a complete problem for crops, gardens, homes, and urban infrastructure.
In agriculture, the combination of 12 thousand teeth and explosive reproduction allows a group of just a few hundred individuals to destroy an entire plantation in a single night.
They feed on more than 500 species of plants, from lettuce, peas, papaya, and mango to expensive ornamental plants in residential yards.
When fresh food is lacking, they enter survival mode and start eating dead plants, animal remains, and even other native snails, pushing local species towards extinction.
To keep its shell strong, the giant snail needs calcium. And it finds this in paint, mortar, concrete, and bones.
In practice, it climbs walls, reaching heights of 6 or 7 meters, and scrapes facades and windows in search of limestone. There are records of snails covering walls, pipes, and second-floor windows behind any source of calcium.
The slime of the giant snail is also a problem. The mucus contains acids and enzymes that degrade materials, clogging agricultural pumps, blocking water pipes, and accelerating metal corrosion.
In some states, snails have already invaded electrical substations and control panels, causing shorts because the slime is slightly conductive.
When the invasion reaches entire neighborhoods, measures are extreme. In one of the campaigns in Florida, a community was under quarantine for two years, prohibited from moving soil, plants, garden debris, or fertilizers out of homes, precisely to prevent eggs and snails from being accidentally transported to other areas.
The Parasite That Attacks The Human Brain
If the destruction of crops and concrete would already be sufficient reason for concern, the greatest danger of the giant snail is invisible.
The slime and body of this mollusk can harbor one of the world’s most feared parasites, known as the “brain-eating parasite,” associated with a rare and serious type of meningitis called eosinophilic meningitis.
The cycle is cruel: the snails eat rat feces that contain the parasite’s eggs. These eggs settle in the liver, lungs, and lymphatic system of the giant snail.
When a person consumes raw vegetables contaminated with slime, poorly washed fruits, or handles snails and then touches their eyes, nose, or mouth, they can become infected with a minimal amount of the organism.
Symptoms range from severe headaches, neck stiffness, and vomiting to seizures, paralysis, loss of skin sensitivity, and in the most severe cases, coma and death.
The World Health Organization describes this disease as capable of causing severe and possibly irreversible damage to the central nervous system.
There is no specific cure: doctors treat the symptoms while the immune system tries to eliminate the parasite.
Medical literature worldwide has already recorded more than 3 thousand cases in over 30 countries. In just one locality in China, there were 125 cases in a single outbreak.
In Hawaii, one of the areas with the highest infection rates in the United States, more than 80 symptomatic cases have been confirmed since 2004, including patients with total paralysis after consuming wild greens harvested after rain.
A 2019 study from the University of Hawaii found the parasite in 58 percent of the analyzed wild snails.
And this is not the only risk. Analyses of giant snail slime conducted in partnership between the University of Florida and the U.S. Department of Agriculture detected Salmonella, other pathogenic bacteria, worms, and microorganisms capable of causing intestinal and skin infections.
Even the eggs have mild toxicity and can cause severe skin irritation, which is why it is not recommended to touch them with bare hands.
Why Is It So Difficult To Eliminate The Giant Snail?
Eradicating the giant snail seems simple on paper: apply poison, collect the animals, destroy eggs. In practice, it is almost an impossible mission.
First, because of reproduction. The giant snail is hermaphrodite, meaning each individual has both male and female reproductive organs.
When young, they function as males; as they grow, they become complete hermaphrodites. This means that when two snails meet just once, both can become “pregnant”.
Mating occurs at night, can last up to two hours, and the giant snail is capable of storing sperm for up to two years.
Even if an individual is captured later, it may still be carrying stored sperm, ready to fertilize eggs later on.
A young snail lays about 100 eggs; when mature, it can lay 200 to 400 eggs at a time, three to six times a year.
Under ideal conditions, a single animal can produce more than 2 thousand eggs a year, and approximately 90 percent of them hatch within two weeks. The babies are independent from birth: they feed and grow without any parental care.
Besides that, the giant snail has a type of “survival mode.” In dry or cold periods, it buries itself deep in the soil and forms a calcium carbonate membrane sealing the opening of its shell, entering a state called estivation.
In this phase, it does not move, does not feed, becomes resistant to pesticides, and can survive for up to eight months on just the water stored in its body, resuming activity as soon as the rains return.
Its hiding place also plays to the species’ advantage. Giant snails burrow into pipes, roofs, tree cavities, pots, greenhouses, wall cracks, and any damp corner.
Did you spray the garden? They go down to the drainage system. Did you treat the soil? They go up to the roof. With each wave of chemical control, part of the population simply hides and waits.
The Giant Snail As A Business In Other Countries
While Florida invests millions to exterminate the giant snail, some countries see the same species as an economic opportunity.
In Ivory Coast, for example, the giant snail is part of traditional cuisine and has become the foundation of an industry.
With deforestation drastically reducing the number of native snails, farmers have started breeding the species on about 1,500 farms just in the humid south of the country.
Specialized companies transform giant snails into meat, soaps, shower gels, and cosmetics made with slime, rich in glycoproteins and hyaluronic acid.
One kilogram of slime can cost US$ 150 to 300, helping small producers earn around US$ 20 thousand per year in regions where the minimum monthly wage hovers around US$ 125.
In Asia, some governments avoid putting the giant snail on the plate, but use it as a tool. Chinese researchers have shown that the tissues and shells of these animals accumulate heavy metals and contaminants, turning the giant snail into a walking biological sensor.
Apps allow residents to photograph snails, send their location, and specialized teams collect the animals to measure pollution levels and create detailed contamination maps.
In certain cities, one ton of giant snail is processed into calcium-rich material for construction and organic fertilizer, reducing costs by up to 40 percent compared to simple incineration.
Still, authorities reinforce the warnings: do not touch, do not breed at home, and do not consume without strict controls, due to the number of parasites that the species can carry.
How Florida Responds To The Threat Of The Giant Snail
Given this scenario, the United States considers the giant snail a national threat, not an opportunity.
The Department of Agriculture classifies the species as “unconditionally prohibited”, meaning it is not allowed to breed, sell, transport, or even study it in a regular laboratory.
In Florida, high-risk areas receive rotating chemical treatments with metaldehyde- and iron phosphate-based products every 7 to 14 days. These compounds do not explode or burn the snail, as some internet jokes suggest.
They destroy the glands that produce mucus, without which the animal cannot move, eat, or retain water. Within 48 to 72 hours, the snail dehydrates and dies.
To increase efficiency, the state maintains night patrols between 10 PM and 4 AM, exactly when the snails leave their hiding spots.
During a single rainy season, teams have collected 3,500 snails in 12 nights, with some neighborhoods recording over 300 individuals in a single search shift.
There are also four-legged allies. Trained detection dogs, like Raider and Bear, work in official programs to locate burrows of buried eggs at a depth of 10 or 12 centimeters.
In just one year, one of these dogs helped find 43 groups of eggs, equivalent to more than 10 thousand potential new snails.
State laboratories also utilize environmental DNA technology. With just two grams of soil, technicians can detect traces of the giant snail’s genetic material even when no animals are visible.
This allows for isolating areas before outbreaks explode, reducing the reaction time compared to traditional methods.
Despite all these measures, the outcome so far is clear: temporary control, not definitive eradication. Whenever the weather, the black market, or human carelessness combine, the giant snail reappears.
What The Giant Snail Reminds Us About Invasive Species
The story of the African giant snail shows that not all ecological disasters begin with a large or visibly threatening animal.
Sometimes, it all starts with a small mollusk that someone brought in a suitcase, raised as a pet, or released into the yard without thinking about the consequences.
In just a few years, that same snail can destroy crops, corrode houses, clog water systems, spread parasites, and cost tens of millions of dollars in emergency campaigns.
At the same time, the same species can be exploited as food, cosmetics, and pollution sensors in other countries.
In the end, the giant snail is a reminder of how fragile ecosystems are and how seemingly small human decisions can have gigantic effects.
It also highlights how each country needs to balance risk, economy, and public health when dealing with invasive species.
And you, after learning the story of the giant snail in Florida, do you think Brazil and other countries should treat this species solely as a threat or try to turn part of the problem into a safe and controlled opportunity?
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