How do you know if a bird is a boy or girl?

well, to tell if the bird is a boy or girl you can see the colour of it's nose or because usually the colour of the nose is inaccurate then you can look at the colour of your birds eye and see. if they have a brown ring around a black iris then it's a girl. if it's fully black then it's a boy. hope this helps :) it worked for my birds better then the nose colour