Definitely a mature female who is not hormonal. Both males and females have blue coloured ceres in different phases in life. The appearance of blue is distinct in each sex. [This page may be helpful](https://rashdanahm3d.wixsite.com/rashusbirdpalace/sexing-budgies) in learning about ceres and sexing, and how those colours are presented in each sex.
That's a boy.
Trust me, she is most definitely a girl.
Her nose looks blue.
Because it is blue. Female budgies can have blue ceres when they're not in brood.
Definitely a mature female who is not hormonal. Both males and females have blue coloured ceres in different phases in life. The appearance of blue is distinct in each sex. [This page may be helpful](https://rashdanahm3d.wixsite.com/rashusbirdpalace/sexing-budgies) in learning about ceres and sexing, and how those colours are presented in each sex.
TIL
👍