The non-native lizards breeding in Florida now outnumber the native species, and there are several large, invasive lizards that are of special concern. This quick reference guide is a quick reference guide to identification of the largest lizards you are likely to see in Florida, and the appropriate action to take in the event of an encounter. Written by Steve A. Johnson and Monica E. McGarrity and published by the UF Department of Wildlife Ecology and Conservation, March 2011.
http://edis.ifas.ufl.edu/uw352