Color Mutation? Or something else.

[Owlet]

Parrot androgen insensitivity?

I think the color changes are related to having testosterone. Maybe this young male, Atlas, simply didn’t have much testosterone expressed in his body.

Did they explain why Atlas has these different feathers?

I dont remember there ever being a clear answer why, just speculation.
looked back on what posts I could find and there was no clear answer. Just speculation from chimerism, hermaphrodite, and hormonal imbalance being the prevailing theories. My bet is hormonal imbalance since as he grew he grew in the green feathers. We see both hermphrodites and chimeras in nature with birds occassionally and they naturally retain both aspects of the genders

 

[Mom2Rain]

Heres an example of an adolescent male eclectus expressing large amounts of female characteristics. His name is Atlas and I followed his story in one of the eclectus Facebook groups. We weren't sure were he was gonna go but as you can see he eventually took on mostly green feathers. I believe he is around 2 and a half in the largest picture but I could be wrong. You girl could be in the process of going through the changes like he did if shes only 3.

Look at that!! Thank you for sharing this.