u/Idkaixo

I have a question, which may seem obvious but I am no bird expert and I'm trying to settle an argument with my brother. I'm wondering what is the gender of my bird, I was thinking he is a boy because of the fact he is bigger than my other bird (female) and sings louder than her, but other than that, when it's nesting season, he likes to go in the same corner as my female bird and sing, and they haven't mated or even shown interest in mating despite both birds being over 2 years old.