Thanks for the info, yes, that would pose a problem, it could be another version of S373 if it got out of hand. I guess it wouldn't be good, from what I know it's slightly harder to find pure Everglades rats now, thanks to the yellow rats. However,do you agree with an experienced keeper creating and keeping a hybrid, never to breed it? I don't agree with breeding hybrids/intergrades, you can always produce more.