University of Florida
Florida Museum of Natural History: Identify a Florida Snake
This field guide to the snakes of Florida has everything you need to identify one, including drawings of scale patterns and excellent photographs, as well as how to recognize which ones are venomous. Also included is a section on how to...
PBS
Pbs Mathline: Snake Patterns Lesson Plan [Pdf]
Determine the rule for the number of black vs. red rings on a snake. Printable lesson.
Other
Kingsnake.com: Central American Ratsnake
With a general overview of the Central American Ratsnake, Kingsnake.com introduces five subspecies, common names, range, behavior, habitat, size, coloration, pattern, and color photo.