the little baby just came out the nest box yesterday trying to start eating on his own.but for my surprise he has no baby barring !! he is not opaline green he is just normal green..both parents normal greens.so i took a look at his younger brother in the nest box ..the same clear cap!!! is that some kind of mutation ?
Some pieds have a clear spot on the head. For example some budgies that are split for recessive pied have the clear pied spot but their wings don't show the pied markings. This would explain how the parents don't show any different mutations. Both or one parent could be split for recessive pied. A photo would be great though.