 The python also turned out to be the first vouchered (verified by a specimen or photograph) occurrence of its species found wild in the Florida Keys.However, over the following year, another half-dozen pythons were found after they were killed by traffic on roads in the same area.The appearance of numbers of Burmese pythons in North Key Largo was forewarning of a serious new threat to the survival, not just of the rare Key Largo Woodrat and Cotton Mouse, but also to another three federally endangered mammals found only in the Florida Keys