Below is short description about how and why it happens:
Why iguanas fall from trees?
Green iguanas are cold-blooded reptiles (ectotherms). When temperatures drop below about 45°F (7°C):
- Their bodies slow down dramatically.
- They become immobile or unconscious in a state called cold stunning.
- Because they often sleep in trees, they may lose their grip and fall to the ground.
This can look alarming, but they usually aren’t dead, just temporarily paralyzed by the cold.
What happens when it warms up?
As temperatures rise:
- Iguanas “wake up”
- Regain movement
- Sometimes crawl or run away
This leads to the common Florida joke:
“Don’t pick up cold iguanas, they might come back to life in your hands.”
When does this occur?
Most often during:
- Arctic cold fronts
- Overnight freezes
- Exceptionally cold winters
South Florida (Miami, Fort Lauderdale, Naples) sees this most because iguanas are most concentrated there.
Safety tips
If you encounter a fallen iguana:
- Don’t assume it’s dead.
- Avoid handling, they can bite or scratch when they warm up.
- Leave it alone unless it’s in a dangerous area (road, doorway).
Why there are so many iguanas in Florida?
Green iguanas are invasive, introduced via the pet trade in the 1960s. With few natural predators and warm weather, they thrived, until the occasional cold snap reminds everyone they’re tropical creatures.
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