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Florida’s nickname, the "Sunshine State," belies a complex mosaic of more than 80 distinct ecosystems—from mangrove swamps to pine flatwoods. Yet human activity, habitat loss, and the arrival of non‑native species jeopardize this biodiversity. Invasive species compete for resources, prey on natives, spread disease, and can even alter entire landscapes. The following list details the most damaging invaders in Florida and offers guidance for residents and conservationists.
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Originating from Australia, Melaleuca trees were introduced to the U.S. in the 1800s and have since proliferated across Florida. Towering 80‑100 ft tall, they are easily recognized by their peeling bark, which can be gray, tan, or orange. Unlike the native bottlebrush, Melaleuca produces only white flowers. Their voracious water demand outcompetes wetland flora, especially in the Everglades, and each tree can release up to 20 million seeds annually. Federal and local agencies invest heavily in control, yet the species remains a formidable threat. Property owners should consult licensed landscape professionals to manage or remove Melaleuca from their grounds.
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Green iguanas were officially added to Florida’s prohibited species list in 2021. Likely released or escaped from the pet trade, these 12‑18 in lizards consume native vegetation and raid bird eggs, contributing to declines in local avifauna. They thrive in southern counties—Broward, Miami‑Dade, Lee—and occasionally appear northward in Tampa and Gainesville. Iguanas often conceal themselves in man‑made structures such as canals, vacant lots, and drainage systems. Residents who encounter a green iguana should contact wildlife professionals and secure potential entry points to deter future invasions. Anecdotal evidence suggests wind chimes may also discourage these reptiles.
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Tegus, native to South America, can reach 5 ft and weigh 10 lb. The common black‑and‑white striped variety is now a prohibited species in Florida. Their diet of eggs threatens native species, including the gopher tortoise, alligators, and many birds. Tegus are prevalent in Charlotte, Hillsborough, Miami‑Dade, and St. Lucie counties. Report sightings to the Florida Fish and Wildlife Conservation Commission (FWC) and avoid disturbing their habitats.
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First detected on cargo ships in the 1920s, Cuban tree frogs can lay up to 1,000 eggs each year, rapidly colonizing new areas. Active during wet months, they prey on insects, native frogs, and small lizards. Their presence can disrupt plumbing and utility infrastructure. Florida law prohibits capture and release; any found in homes should be removed by licensed wildlife removal specialists.
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Cogon grass, introduced in 1911, grows 2‑5 ft tall with yellow‑green, toothed blades. Its aggressive growth outcompetes native grasses, trees, and wildlife, especially in central and northern Florida. It can choke pine stands and block sunlight for seedlings. Control is most effective when herbicides are applied in fall or by professional landscapers.
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Imported by Spanish explorers in the 1500s, feral hogs now roam Florida in large groups. Weighing 150 lb and 6 ft long, they devastate native vegetation, crop fields, and ecosystems through rooting behavior. They can also pose threats to humans and pets. Legal hunting or trapping requires permits. In 2023, 1,193 sightings were reported; any encounter should prompt contact with wildlife removal experts.
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Introduced in the 1930s to control sugar‑cane pests, cane toads are 6‑9 in long and produce a toxic bufotoxin. This toxin harms native animals, pets, and can cause skin burns in humans. Their rapid breeding outcompetes local amphibians. Capture and handling should be performed by certified wildlife professionals.
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Native to parts of Asia, Burmese pythons average 6‑9 ft and can exceed 18 ft. They thrive in the Everglades, preying on mammals, birds, and reptiles with no natural predators. Their presence has dramatically altered predator‑prey dynamics. Report sightings immediately to the FWC; only trained personnel should handle them.
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Introduced in the 1890s, this evergreen shrub now reaches 30 ft. Its rapid growth and toxic soil exudates suppress native flora and impede nesting of species such as the gopher tortoise. It is especially problematic in western, southern Florida, and the Everglades.
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Originating from the Indo‑Pacific, lionfish entered Florida waters in the mid‑1980s, likely through ballast water. With zebra‑like stripes, they reach 15 in and voraciously consume reef fish, disrupting local food webs. Although no strict collection limits exist, anglers must hold appropriate licenses and avoid protected areas. Report sightings to the Reef Environmental Educational Foundation (REEF).
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First detected in Tampa Bay in the 1990s, these mussels grow up to 6 in and clog pipes, damage boat hulls, and outcompete native mussels. Their presence disrupts food webs and infrastructure. Boat owners should routinely inspect hulls and remove mussels promptly.
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These snails can produce up to 2,500 eggs annually and consume over 500 plant species. Their shell damages stucco and structures, while they may carry meningitis‑causing parasites. Quarantine zones exist in Pasco, Broward, and Lee counties. Eradication efforts have been undertaken in 1975 and 2021; continued vigilance is essential.
