Is it a male or female??

[quailhaven]

I have no clue how to tell if my Chinese quails are male or female. They are about 7 weeks old now and they have moved into a large aviary.
What signs do I look out for?

 

[dc3085]

Button quail come in around 20 different colors. Some can be color sexed, some cannot. You need to show us pictures.