Fifteen years ago, a cold snap froze much of Florida's wildlife to death — including many of the state's invasive Burmese pythons (Python bivittatus). But in this excerpt from "Slither: How Nature's ...

Unseasonably cold weather in Florida affects native and invasive reptile species. Iguanas can become immobilized and fall from trees when temperatures drop to between 40 and 50 degrees. Alligators ...

"The 2010 cold snap may have created a subset of pythons better able to survive cold temperatures — and thus better adapted to spread beyond the northern boundaries of its current range." When you ...