MIAMI - It's a South Florida phenomenon that draws amusement from across the country — when temperatures drop below a certain level, cold-stunned iguanas start falling out of trees. While it may sound bizarre, it happens. And there's a scientific reason for it.

Florida is facing freeze warnings, cold advisories and frost into the weekend. And don't forget to factor in wind chill.

For the third consecutive night, temperatures will plummet into the 20s and low 30s with wind chills below 25 degrees in portions of south central and southwest

When temperatures drop in South Florida, it can cause a big problem for Floridians: falling iguanas. When it gets too cold, the large invasive reptiles — which can grow to be up to 5 feet long and 20 pounds — get stunned by the temperatures and will often fall out of trees onto the ground or whatever may be passing by below.