Since I saw this post back up, I thought i'd update.
I now have 2 button quail in with my batch of coturnix and no problems.
Both are hens and theres nooo issues. I wouldnt reccomend it for anyone else as I'm taking a risk to my BQs doing this but since I'm keepin those two BQ's outdoors this winter I decided if they'd do okay together then they'd stay warmer with more body heat.
My Coturnix are now almost 8 weeks old, no problems, no fighting nada.
I feel blessed after all the problems others seem to have with bloody heads and what not. I really wonder if room is a factor. My guys have a lot of room and have an indoor and an outdoor area...not sure if this makes a difference but i've had no problems as of yet, but will update if i ever do.
They will be separated into trios once spring arives so I can do selective matings.
My oldest button quail hen is the only one who seems to be the boss of the whole flock. If one of the much larger than her coturnix are eating some thing she wants she runs over does this clucking growl, and pecks at their meal until they let it go and yelk like (eek sorry)!
No blood shed, just a spit spat over a tidbit.
I love my coturnix, and to anyone considering raising them, and who are being detered by the possibility of them fighting and hurting and killing eachother. Just look at it this way, chickens can do the same to eachother, just keep a good eye on your birds, try to keep space comfortable enough for them and if you notice any bullies take them out of the pen to see if it minimizes any problems. Just saying, don't omit them from your future plans if you're really interestd in them they're great little birds. Mine dont mind being petted, and eat out of my hand and even "perch" on my hands. They call for me when they see me coming up with food for them, they're just my lil babies and I Love them dearly and wouldnt want to see someone else miss out on the cuties so don't be detered!