you can learn a GREAT deal about budgies at
http://home.ca.inter.net/~dhansen/budgie.html<br /><br />also a great board with this question IN DEPTH is
http://pub98.ezboard.com/fthecockatielstopsmessageboardfrm39?page=9<br /><br />The above is usually true EXCEPT in some mutations it can be different. i have taken many in to the rescue and the owner always called it a male but upon closer look it was actually a female<br />DNA sexing is honestly the only TRUE way to sex<br /><br />Also can not sex by cere color till after first molt around 4 or 5 months<br />Good Luck