Florida is home to more than 500 nonnative species, more than 50 of which are reptiles. Current monitoring techniques depend on visual surveys by scientists, and this is far from an exact science because reptiles — particularly snakes — are extremely elusive. A new technique being developed by scientists at University of Florida's Institute of Food and Agricultural Sciences (UF/IFAS) can identify DNA traces of Burmese pythons — as well as northern African pythons, boa constrictors, and rainbow boas — weeks after they have left an area using soil or water samples.