what you can do is get a peice of string and loop a ring or something slightly heavy on the end.
then hold it perfectly still above the cockatiel (holding onto the end without the ring)
it will start swinging after a couple of seconds
still holding the string above the bird, wait about 30 seconds,
if the string swings in a circle its a girl
if the string swings in a straight line, its a boy ...
if that makes any sense at all
it has always worked for me...
