Iguanas are considered invasive mainly because humans moved them outside their natural range, and in many warm places they now breed rapidly, damage ecosystems and infrastructure, and are hard to control.

Quick Scoop

How iguanas became invasive

  • People transported iguanas (especially green iguanas) through the pet trade, intentional releases, and escapes from captivity.
  • In warm regions like Florida, Puerto Rico, and some Pacific islands, the climate is similar to their native Central/South American habitats, so they survive winters and establish wild breeding populations.
  • Once established, they face few natural predators and plenty of food, so their numbers grow quickly.

What makes iguanas so successful

  • They are highly adaptable herbivores that eat a wide variety of leaves, flowers, fruits, and crops, so they thrive in cities, suburbs, and farms.
  • Females lay many eggs per year, which boosts population growth once they are established.
  • They use burrows and structures for shelter, helping them survive cold snaps and human disturbance.

Why they’re a problem

  • Ecological impacts: They compete with native species for food and habitat, may spread diseases, and can threaten native iguanas and other wildlife.
  • Property and infrastructure damage: Their burrows can undermine seawalls, canals, sidewalks, and building foundations, causing erosion and structural problems.
  • Human and pet issues: They raid gardens and landscaping, can foul pools and patios with feces (including possible Salmonella), and may cause safety concerns when they fall from trees or wander onto roads and runways.

What recent news and forums say

  • Local conservation groups and agencies in places like South Florida regularly run trainings and community efforts on trapping and reporting invasive green iguanas, showing how much of an ongoing, “everyday” issue they’ve become.
  • Online forum discussions often blame the boom in invasive iguanas on irresponsible pet releases and note that existing predators and control programs struggle to keep up with how fast iguanas reproduce.

In short, iguanas are invasive not because they’re “bad” animals, but because in the wrong place—with a friendly climate, easy food, and few predators—they turn into a fast-growing, destructive newcomer that local ecosystems weren’t built to handle.

Information gathered from public forums or data available on the internet and portrayed here.