Iguana GuideHow they arrived
UF/IFAS documents green iguanas in the Miami area by the early 1960s and describes both deliberate and accidental pet releases as contributors to later spread.
Where they thrive
Warm climate, water, canals and human-modified landscapes create suitable habitat. Cold temperatures limit expansion farther north.
Why they are considered invasive
Green iguanas consume vegetation and dig burrows. At high densities, burrowing can contribute to erosion and infrastructure problems around canals, levees and seawalls.
Cold weather
During sufficiently cold weather, ectothermic green iguanas can become lethargic and stiff and may fall from trees. They can recover as they warm, so a motionless cold-stunned iguana should not automatically be assumed dead.
Wildlife rules change
Local wildlife regulations can change. Iguana Guide explains biology and ecology, but removal or control decisions should be checked against current Florida Fish and Wildlife Conservation Commission guidance.
Keep exploring
Iguana facts become more useful when anatomy, behavior, species and habitat are connected instead of treated as isolated trivia.
Sources & further reading
Core factual claims on this page were checked against these references.