Is my budgie a male or female?

you should be able to tell by now, you should actualy be able to tell by the time its 3-4 months old. if it is a "rare exception" you can take it to the vet and if they dont know they will get it DNA tested. or you can order a kit from avian biotech but i warn you, if you dont have much experience with trimming their nails this can be dangerous because you will need to stop the bleeding. the cere is the only way to physically tell. there really is no true way of telling by behavior.