The giant African land snail, a potential health risk to humans, has once again invaded Florida — and officials are using specially trained dogs to sniff out the invasive species.
Florida's agriculture department has called the giant African snail "one of the most damaging" mollusk subtypes in the world. Its unusually large size and ability to procreate in vast quantities allows the creature to infiltrate surrounding areas quickly, posing threats to vegetation and infrastructure because of its appetite for at least 500 different plants as well as paint and stucco.
"We're concerned with that being in our environment," Jason Stanley, a biologist with Florida's Department of Agriculture, told AFP.
Since June 23, employees from his agency have been combing through the gardens of New Port Richey, a small town on Florida's west coast, where the invasive species has taken root.
A single giant African snail can lay up to 2,000 eggs each year, Stanley explains, which — coupled with its appetite — could spell disaster for the state's robust agriculture industry.
In a grassy plot of land in New Port Richey, Mellon, a yellow Labrador trained to sniff out the snails, walks with his handler.
Lorenna Dewitz, an employee of Florida Department of Agriculture, handles a trained dog Mellon, as he sniffs and searches for the giant African snails in New Port Richey, Florida on July 21, 2022.
CHANDAN KHANNA/AFP via Getty Images
He darts under a tree and sniffs around in the grass. When Mellon eventually locates a snail, he sits directly on top of it, as he's been trained to do.
Florida authorities believe that the snail, native to eastern Africa, was reintroduced to the state when someone brought it home as a pet.
Unlike other brown-tinted giant snails, this particular breed has white flesh.
"These white phenotypes are very popular in the pet trade," Stanley noted.
Through the talents of Mellon and another snail-sniffing canine, more than 1,000 giant African snails have already been caught in Pasco County, where New Port Richey is located.
Authorities are also trying to stamp out the giant snails by applying metaldehyde, a pesticide that is harmless to humans and animals, according to the state.
A giant African land snail.
Florida Department of Agriculture Division of Plant Industry
The Florida Department of Agriculture has established a quarantine zone within New Port Richey: no plants or other vegetation can be removed from the area to try to prevent the snails from spreading further.
"Another issue with this snail is that it carries the rat lungworm, which can cause meningitis in humans," Stanley added.
That type of parasite, which has been detected among the snails caught in Pasco County, enters rats' lungs when they eat the snails and then spreads when the rodents cough.
If a human ingests one of the worms, Stanley says, it usually makes its way to the brain stem, where it can cause meningitis.
Local resident Jay Pasqua still can't believe the stir caused by the giant African snail.
In late June, a Department of Agriculture official came to his lawn mower sales and repair store in New Port Richey to flag the presence of the invasive species.
"In the beginning, it was kind of funny to see all the attention that a snail was getting," the 64-year-old told AFP.
"But (after) starting to understand the process of their growth, how they got here, and what diseases and what problems they cause, it did become a concern at that time."
He has since found dozens of the pests in his garden, although he says he hasn't seen any for three days.
The snails are mobile — experts warn that they "cling to vehicles and machinery," plus trash, to "move long distances" — and resilient, with the capacity to survive for a year while "inactive" and buried in soil to shield themselves from unfavorable weather.
The giant African snail has been eradicated from other parts of Florida twice before, first in 1975 and then again in 2021.
The latter extermination campaign took place in Miami-Dade County and was the result of 10 years of effort at a cost of $23 million.
Stanley says he's optimistic that this time will be much easier.
"So far, it's isolated in one area, and we're already surveying and treating this area. So we're very hopeful that it's not going to take that amount of time here."
Emily Mae Czachor contributed to this report.