How do you tell the sex of Button quail?

[kbell]

I have one pair I know, I have gotten fetile eggs from them and that's how I had another "one". Then I bought some eggs and now have another "one." So now I have 2 lonely little Quail and would like to know if I could put them together as a pair. How do I sex them? I have no clue. Thanks for any help you can send my way.

 

[GrandmaBird]

a male will have reddish feathers in the vent, butt, area. The male also has a bib under his chin. Or you could post photos if you need more help