Birds like humans are different individuals, quails for the most part can be really agressive to different species even against themselves, you just gotta know your birds, and even then you'll get some surprises. For example I used to have a bobwhite a coturnix and a chukar all together in the same pen and they were fine never had a problem, recently the bobwhite died and i moved the coturnix out of the chukar pen and put it with a batch of other coturnix where she was well accepted. Then I moved my chukar with a batch of 15 bobwhites and she was also well recived in there, now from those 15 bobwhites I tried to move half to a pen with older bobs but theyu were not well recived at all so had to move them back to where they where and they live really happy with the Chukar their friend.
Now I also have 2 Gambels who will kill everything that approces them so far I've lost 2 coturnix and 2 bobwhites to them.
