This link might also be of interest.

It's introductory paragraph states:

"This is a collection of links to sites which which might interest a color genetics hobbyist. The links are presented by species, and under some species there are first links to general color genetics pages and then links to pages about special colors and patterns in that species. The quality of these pages varies a lot from small photo galleries to vast genetic resources. Last checked and updated 2004-09-01."
Pet Rodent Color Genetics Links