I have 19 5 week old coturnix in a 18 sq. ft. pen. So the last few days every time I have gone out to the pen it has seemed like all of the birds have been flushing and running around like crazy, I figured it was me they were responding to. So yesterday morning I spent some extra time watching them and noticed one particular roo being very aggressive and pecking the head, eyes, and face of any bird that came close to him. And he was chasing them. I put some extra sand in their box for an added distraction and went to work. I get home last night and there was blood all over the pen. (who would have figured ) one of the lesser males had a bald and swollen head. One of the hens (the bleeder) fortunately was only injured on the tip of her wing but that is what flung the blood all over. and all of the other bird were frantic. I watched again for a while and sure enough the aggressive roo was causing a ruckus. Didn't take me but about 10 minutes to dress him out and pop him in the deep freeze. The best thing is that now that the bad boy is gone, immediately all of the other bird were very calm and there was peace. Amazing how one bird can affect the dynamic of the whole pen. Does anyone think that now that the trouble maker is gone another roo will resume the over the top behavior? Or is theere a chance that the peace will last for a while?