Yeh I should of been more specific.
Timber Rattlesnake
They are rare even as far north as I am, those little ones are here, but also rare.
In my experience the,
Copperheads and Cotten mouth, are our biggest threats here.
Some training on Snakes
http://mdc.mo.gov/sites/default/files/resources/2010/05/5187_3026.pdf
http://www.muherpsociety.com/id8.html
http://extension.missouri.edu/publications/DisplayPub.aspx?P=g9450
http://mdc.mo.gov/discover-nature/outdoor-recreation/nature-viewing/amphibians-and-reptiles/snakes
I research these sites every spring, and other books, before I start spending time in the field chasing eatable creatures.
You can probably do the same for your area, where ever that might be.
And on a side note, they forgot to mention me.
Missouri Toads and frogs