Close up photo of a large green iguana

Exotic Lizards in Central Florida

Plants and animals that live outside of their native ranges as a result of human activity are known as exotic species. Although not all exotic species become invasive, those that do have the ability to harm ecology, economy, and human health. These non-native invasions have caused an imbalance in Florida’s reptile populations. Read on to learn more about identifying the exotic reptiles we have in central Florida.

Green Iguanas

There are many former pet iguanas that have either escaped or been released. These reptiles have established populations in both south and central Florida. Green iguanas are large lizards that can grow to be 4-6 feet long.While young, green iguanas have a vibrant green color which tends to dull to a grayish green with age. Additionally, individuals may develop a reddish orange coloration during the breeding seasonMale green iguanas can be identified by the larger spikes along their back. 

Adult green iguana on a seawall in Florida

Adult green iguana. UF/IFAS Photo by Thomas Wright

Green iguanas are vegetarians and tend to feed on foliage, flowers, and fruit. Although they do not compete with our native lizards, they do cause problems in other ways. For instance, their feeding often damages and destroys landscape plants and shrubs, flowers, and dooryard fruit (with the exception of citrus). The sight and smell of their waste are also often problematic.

Nile Monitor

Nile Monitor, an exotic lizard in Florida, climbing a canal bank.

Nile Monitor, an exotic lizard in Florida. Photo courtesy of Florida Fish and Wildlife Conservation Commission .

Nile monitors are large lizards that can grow to be over 5 feet long and weigh approximately 15 pounds. They tend to be light yellow to dark olive or brown in color and have a light yellow chevron pattern on their backs.

Nile monitors are semi-aquatic and can often be found basking in the sun or foraging for food along canal banks. Nile monitors are excellent swimmers. These reptiles have the ability to stay submerged under water for long periods of time. They are active during the day, and often retreat to their burrows or other refuges at night.

Nile monitors have a varied diet feeding on mammals, birds, reptiles, amphibians, fish, and eggs. Because of this, the Florida Fish and Wildlife Conservation Commission (FWC) has high concerns about their social, economic, and environmental impact.

Argentine Black & White Tegu

The Argentine black and white tegu is a large lizard that can grow up to four feet long. They are black and white in color with banding along their tails. Adolescent tegus have greenish heads. Tegus primarily spend their time on land. However, they are proficient swimmers and can remain underwater for long periods of time. Tegus are active during the day and burrow at night.

Argentine black and white tegu in a sandy scrub ecosystem

Argentine black and white tegu. Photo courtesy of Florida Fish and Wildlife Conservation Commission

The Argentine black and white tegu’s diet primarily consists of fruits, eggs, insects, and small animals such as lizards and rodents. Dog and cat food attracts black and white tegus. Therefore, do not leave pet food outdoors.

The tegus have the potential to compete with and prey on Florida’s native wildlife and threatened species. They are very resilient creatures who can survive temperatures as low as 35 degrees and reproduce quickly, laying up to 35 eggs per year. Because of this, the FWC has high concerns about their environmental, economic, and social effects.

How Can I Help?

Please report these species so we know their current location. To report sightings of exotic species, visit the Early Detection and Distribution Mapping System’s (EDDMapS) webpage and follow these steps:

  • Using the toolbar on the EDDMapS homepage, click “Report Sightings”.
  • Select the location of the invasive species that you are reporting.
  • Choose which type of species that you are reporting (plants, insects, diseases, or wildlife)
  • Complete the report form and upload any images that you may have when prompted. You can also add any additional information that may be helpful at the bottom portion of the form.
  • When you have completed the web form, click “submit report” at the bottom of the page.

You will need to create a FREE EDDMapS account when prompted in order to report your sightings. For additional instructions on how to report exotic species online, click here for a step-by-step guide.

You may also report species by downloading EDDMapS’ app, “I’ve Got 1” from the App Store for IOS or Google Play store for Android.

 Apple App Store Download button      Google Play Store Download button


If you enjoyed this series and would like to read more about commonly confused plants and animals in Florida, you can find more here:




This blog post was written by Natural Resources Extension Program Intern, Ms. Paxton Evans, under supervision by Natural Resources and Conservation Extension Agent, Mrs. Shannon Carnevale.

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