How Burmese Pythons Conquered the Everglades

The Burmese python (Python bivittatus) invasion of the Florida Everglades is a textbook case of pet-trade gone wrong, amplified by a hurricane.

Phase 1: Pet Release (1970s–90s)

Thousands imported as exotic pets. Owners released them when they grew too large (6–23 ft), expensive, or dangerous. Intentional "dumping" was common—Everglades’ vastness seemed like a "good home."

Phase 2: Hurricane Andrew (August 1992)

Category 5 storm destroyed exotic wildlife facilities, pet stores, private collections in South Dade. Hundreds of pythons escaped into adjacent wetlands. Genetic studies confirm multiple founding lineages—not just pet releases.

Phase 3: Establishment & Explosion

Perfect storm: No natural predators (adults), ideal climate (subtropical wetlands), abundant prey (raccoons, rabbits, deer, birds, alligators, pets). Females lay 20–100 eggs/year. Population estimates: 30,000–300,000+.

Ecological Carnage

• 99% decline in raccoons, opossums, bobcats, marsh rabbits (Dorcas et al. 2012).
• Predation on wading birds, alligators, Key Largo woodrats (endangered).
• Competition with native predators (panthers, indigo snakes).

Response

• FWC Python Removal Program – Paid contractors (>18,000 removed since 2017).
• Python Challenge – Annual public hunt (prizes, training).
• Detection dogs, eDNA, Judas snakes (tagged males) – Tracking tech.
• Ban on import/possession (2012 federal, 2021 FL).

Outlook: Eradication unlikely. Suppression is the goal. The Everglades food web is permanently altered.