I've got some new little girls Sooty is the little black mouse she's so tiny (because she's a runt) but her massive personality makes up for it. And Sandy is the blonde one. Sandy has something called Leucism, this explains her beautiful colour. It's a genetic defect where some pigmentation is missing but not Melanin. This gives Leucistic animals a sort of faded appearance, like they've been through the wash a few times.