When I first met Comet, it was straight from the egg of my 1st parakeet Pie.
You might recollect the thread I had made dedicated to finding out what Comet's colors were.
When he had fledged out and was at 3 months, he had strange colors. Attached photos 1 and 2 are of him at this time..
Photo 3 is of him now, at a yr old. Notice the great difference there! He is now a wild type split for blue visually at his age!
Parakeet feathers can be deceiving! I wonder what he's split to have gone through this? Or if it's a normal thing that sometimes happens. Mom and Dad are both wild types split for blue. In the second clutch from them, the only male is looking the exact same as Comet did at his age. The new baby girls just look like their parents right of the bat. So the gene is passed down from the mother, then... I think....
He is so handsome! He is a cobalt normal yellow face type 2. One of you parents must have been hiding it under their green. His colors were really unusual as a chick! It is just coincidence that your boys cameoutvthe same as it isn't sex linked.
Yes, in YF2 the yellow spreads through the whole body turning a blue budgie green. So he isn't split to blue, he is blue but with YF2. So if you were to breed him with another blue you would expect all blues and half to be YF2.
I could be totally wrong though! Maybe his baby feathers were just an odd mix.
He looks like a normal green split for blue, and possibly carrying a violet factor to me When they are split for blue it can show quite a bit on their underbelly and chest, especially in the right lighting. Unless the bird is also carrying a violet factor, the blue hue is molted out the first time.
A sf yellowface II chick would not be that bright yellow in color before, or after their first molt.