Are you referring to white mice which have red eyes naturally ? I have never seen black rats have red eyes.I don't know how much this could relate to budgies, but I do know for a fact that red-eye rats have poorer eye sight than black eyed rats. I've owned many pet rats in the past years (much more than budgies) and the red-eyed rats always show signs of poor eye sight. They are much more hesitate to approach objects/people, they remain still and sway back and forth a long time, trying to figure out what something is, and they seem to startle easier.
-shrugs- It's interesting.
No mice, "fancy" pet rats. Rats come in MANY (about 30+) different color, body, and pattern variations. Like budgies, really.Are you referring to white mice which have red eyes naturally ? I have never seen black rats have red eyes.
If you have red-eyed rats, were there being cross-bred with white mice ?