We have a ten week old baby budgie who has already developed darkish brown iris rings!! If I had purchased him I would think he is between 4 and 8 months. Why is he developing them so soon? A few other babies seem to be beveloping them too, of the three we still have. Also one of the babies Zeus who is only going to be 9 weeks on Saturday has dark brown rings! Even though he is suppose to be a recessive pied. What could be going on, or are they just different?