Budgie Mating Behavior Videos

I have this white budgie with hints of lavendar in its feathers and has light grey wings its just 2 yrs old. I also have a male, I have a nesting box, and the white one spends ages in there fluffing around, but has never laid any eggs, so this is making me think its [...]

We bought him/her four months ago. The pet shop owner said that it was definitely female but he/she seems to have a blue cere (though it is quite pink/purple in places and blue around the edge.)
Picture here:
http://img10.imageshack.us/my.php?image=p9230003l.jpg

I have had my budgie for a while but the problem is i dont know what sex it is! it had a light brown cere when i got it but now it is light blue and sort of shiny atround the edges. it looks very different to the other budgie i have which is [...]

The shopkeeper said he’s a male, but I don’t trust pet shops so much!
http://i87.photobucket.com/albums/k138/zulphur_/Pets002.jpg
http://i87.photobucket.com/albums/k138/zulphur_/Pets001.jpg
i know u can tell by the color of the cere on its beak, but it is a young budgie because there re still bands on its forehead. I’ll be slightly disapointed if it is actually a female, because i cant [...]

I have a 1 and a half year old budgie with a bright pink upper bill and after countless internet searches I can not figure out what sex this color means. If anyone can shed a little light on this it would be great.