Robin,
In my neck of the woods (west TN and KY), we have a plethora of crayfish species. In the two states of TN and KY, more than 150 species of crayfish have been identified. There are a number of color and size variations between species, as one would expect. There is even one species, located in the Green River of western KY that is cobalt blue. Below is a link that has pictures of a few different species from various locations in the U.S. of course, it is NOT an all inclusive listing! [url=http://webby.cc.denison.edu/~stocker/cfgallery.html:267cd]http://webby.cc.denison.edu/~stocker/cfgallery.html[/url:267cd]