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This is the sort of thing that can be a problem if you keep almost all of the meeces you breed. I have had a flood of BEW's born in my mousery, even though I haven't been breeding for them. They are largely a product of breeding brindles to tris in several generations in a row. I just found a reference that explains why that happens :book5 ...a little too late...but, hey, they're mousies, and that's alright with me. :|
