INDIAN RIVER LAGOON, Fla — Some people spend their retirement traveling the world or relaxing at home. Sid Pennington spends his trapping the invasive lizards threatening native wildlife in his community.

Pennington, 60, has singlehandedly captured at least 117 Argentine black and white tegus from the woods and neighborhoods in western Fort Pierce where he lives.

In September, after the Florida Fish and Wildlife Conservation Commission saw how skilled Pennington was at catching nonnative tegus on his own, biologists lent him 20 traps and recruited him as a volunteer. He’s caught 31 this year alone.

“I grew up being a big reptile guy,” said Pennington, a former employee at the St. Lucie Nuclear Plant. His first catch was a female tegu in 2019, measuring just under 4 feet long. “I don’t want them to be here. But it is fun.”

What is a tegu lizard?

The Argentine black and white tegu lizard is a species that arrived to Florida through the exotic pet trade. They are one of the largest lizards in the Western Hemisphere, achieving a length of 4 feet long, according to University of Florida.

Their omnivore diet includes fruits, vegetables, eggs, insects, and small animals. As a predator, the tegu is likely to have harmful effects on south Florida’s native wildlife, according to University of Florida.

Tegus eat the buried eggs of reptiles, specifically alligator and turtle eggs. Due to their diet, their growing population threatens the population of endangered native species of Florida, such as crocodiles, sea turtles, ground-nesting birds and Key Largo woodrat.

Sid Pennington (left) a FWC volunteer in Fort Pierce, and Alex Furst an FWC nonnative biologist from Ft. Myers, carry a trapped Argentine black and white tegu lizard at Ffa Road on Wednesday, April 20, 2022, in Fort Pierce.

Tegu populations spreading in Florida

With sharp teeth and scaly black-and-white splotches, tegus may be spreading faster than biologists can trap them.

The South American lizard’s appetite for the eggs of native animals — such as killdeer, alligators and gopher tortoises — and its ability to flourish in cooler environments has prompted a strong response from FWC. If tegus start spreading north, it could wreak havoc on native species already straining from habitat loss and overdevelopment.

Tegu’s population likely originated from escapes or releases stemming from the exotic pet trade, according to FWC nonnative biologist Dan Quinn. The species is now successfully breeding throughout e other Florida .

Over 12,000 tegus statewide have been removed from the wild to date.

Residents have credibly reported at least 132 tegu sightings in western Fort Pierce since 2016, according to the Florida Fish and Wildlife Conservation Comission.

“They’re starting to make a foothold here,” Quinn said of Fort Pierce during a news conference off Rock Road Wednesday. “Since 2016, when the first tegu was reported, we’ve seen an uptick in reports. We think it’s possible the population is increasing in this area.”

There’s strong evidence tegus are affecting native species across Florida. A lizard caught in Charlotte County had gopher tortoise eggs in its stomach. University of Florida researchers in 2014 documented a tegu eating alligator eggs.

In April 2021, the FWC deemed tegus a “high risk” species, and banned owning or breeding them. The remaining tegus in captivity can live out the rest of their life, but any future sales are prohibited.

Tegus are lured to traps by chicken eggs and are then humanely killed, Quinn said.

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Dan Quinn, a nonnative fish and wildlife biologist with the Florida Fish and Wildlife Conservation Commission, discusses the observation and trapping efforts for the invasive Argentine black and white tegu lizard while parked at Ffa Road on Wednesday, April 20, 2022, in Fort Pierce. The area of Ffa and Heil roads are one of several areas where the lizards have been reported and removed in Fort Pierce.

What other states have tegu lizards?

According to the Smithsonian these are the states where the tegu lizards have been spotted:

  • Florida
  • Georgia
  • South Carolina
  • Alabama
  • Louisiana
  • Texas

The Georgia’s Department of Natural Resources also urges for the eradication of tegu lizards.

Florida’s costly invasive species: Pythons, lionfish, iguanas

When it comes to removing invasive species, state wildlife biologists have their hands full. The FWC has removed thousands of Burmese pythons from the Everglades, overseen a multiyear statewide effort to kill lionfish from Florida waters and actively encourages iguana removal.

Tegus are now the latest animal on the list of problematic species, and the state has spent roughly $1.3 million since 2016 to reduce the population, according to FWC spokesperson Lisa Thompson. A female tegu can lay roughly 35 eggs annually.

As temperatures increase with climate change, cold-blooded invasive species will spread wider and faster. A population of tegus, for instance, has already been recorded in Georgia.

This past week, FWC outreach teams sent 3,800 mailers to St. Lucie County homes near where tegu sightings were documented and placed five informational signs along busy roadways. They’ve also visited hundreds of houses in the area, distributing brochures that read: “How you can help stop the spread of an invasive lizard.”

The goal is to inform the public and encourage documenting verified reports, Quinn said.

“We suspect more people are seeing them and not reporting them,” he said.

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