Okay so I have two budgies ones a year or older I believe and the new ones about six to seven or eight weeks old I understand budgies with blue ceres are males budgies with brown/pink/tan are female well the older one his body colors are mostly white on the bally with some blue spots and black on the back like those stripes and some white back there his/her cere is kind of like purplish pink with a little blue but its kind of light with tan around the nostrils but he/she kind of behaves like a girl i think like the aggressive part and makes that ack ack ack angry sometimes but rarely. The yellow one (new one) is nearly all yellow with a tiny bit of green on the butt he seems to be a boy but how can i tell what do you guys think do you think the old ones a girl??? the yellow ones cere is kind of the same looking he also has a tiny black spots though on his wing there very faint though.