Imagine the shock of running over a snake this size. Some one hit this large snake just north of the refuge, this is a sign that they are more than likely already on the refuge. Theses pythons were released pets that have started reproducing, and multiplying rapidly. Obviously they are non-native and a threat to many native species. I am happy to find them dead rather than alive.
Some python links:
Python bursts after eating gator
Python tracking puppy
Everglades Burmese Python Project
Species Fact Sheet