There are 4 types of "silvers" that I know of. The axanthic blondes which have been proven genetic. They are a double homozygous mutation, both the blonde trait and the axanthic trait being simple recessive. Then there is an, I assume generic silver morph with normal pattern. I don't know much about it other than I've seen babies for sale so I assume it's been proven genetic. And there are 3 wild-caught silver morphs, 1 female silver (she's actually more gray than silver)that was collected as a subadult in the Christmas Mtns. in 1999 by Shawn Devero, 1 female silver(very light almost white-silver) that was collected by myself and Ric Blair as a subadult in 2002 at Black Gap and 1 male silver that was collected as an adult in 2003 also in Black Gap within a mile from Ric and I's by a guy from Kansas. To my knowledge the guy from Kansas hasn't produced any. I have the female from Xmas and the female from Black Gap. They are both paired up with normals that I colleced and I am keeping them locality pure. Next year will be the first year I will possibly produce (unproven) hets. from both. It will be interesting to see if these localities prove out whether they are the same gene.