weird question for green cheek

[bubbaanddaisy]

okay so i was do these exercise with my 2 green cheeks both are supposed to be different sexes. when i was caring the boy upside down and same with the girl i could see their anus is that normal and could you tell the gender by the same way? this is the first time ive seen this

 

[ConureLady]

A birds anus is called a vent. The vent should appear clean. A dirty vent can mean a sick bird. It is normal to see it. And no you can't tell the sex by the vent.