In Florida, winter can turn a tree into an awkward place to stand under. When cold snaps move across South Florida, green iguanas can appear lifeless on sidewalks, lawns, and canal edges. The animals are not actually frozen. They are typically in a temporary torpor-like state, a cold-induced shutdown that slows breathing, heart rate, and muscle control. Because these lizards are ectotherms, their body temperature and metabolism are shaped by the environment around them, which is why a sudden dip in air temperature can leave them limp enough to fall from branches.
That stillness is what creates the mistake. A cold-stunned iguana may look dead, but wildlife officials have repeatedly warned that recovery can happen quickly as temperatures rise or as the animal warms in a sheltered space. The Florida Fish and Wildlife Conservation Commission has said people should never bring it into a home or vehicle to warm up. Once movement returns, the animal may defend itself with sharp claws, teeth, and a powerful tail capable of whipping with force.
The risk is not only from bites and scratches. Local trappers interviewed during past cold events also warned that iguanas can carry bacteria in the mouth, and handlers were advised to use gloves and protective clothing. During one state-authorized collection period, the commission instructed the public to place captured animals in a secure, escape-proof cloth sack or bag and transport them immediately, precisely because an apparently inert reptile can regain mobility before a person expects it. The guidance reflects a basic reality of reptile biology: immobility is not the same thing as safety. A large green iguana can approach six feet in length, and even a partial recovery inside a car, garage, or laundry room can turn a casual rescue attempt into a struggle with a stressed wild animal. Pets face the same hazard if they investigate too closely.
Cold-stunning is also not unusual enough to treat as a novelty. Researchers and wildlife officials have noted that iguanas in Florida have been observed slipping into these episodes when ambient temperatures fall below 50 degrees Fahrenheit, though size, prior exposure, and the pace of the temperature drop can all shape the response. The spectacle gets attention on social media, but the underlying pattern is older than the hashtags: green iguanas were introduced to South Florida decades ago and now persist in a climate that periodically pushes them beyond their comfort zone.
That mismatch matters for people as much as for the lizards. Florida classifies green iguanas as a prohibited invasive species, citing damage to property, waterways, and habitat. During a rare two-day cold-weather exemption, more than 5,000 cold-stunned iguanas were turned in to state offices, illustrating both how widespread the animals are and how many of them become visible when temperatures plunge. A motionless iguana can look like a harmless oddity of subtropical weather. In practice, it is a live wild reptile in metabolic distress, and that is exactly why touching it can backfire so fast.
