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Assuming those are button quail, from your picture - in general you can't keep more than one male in an enclosure that has females. When it's worked till now, it's probably both because it was new territory - none of them felt it was theirs and that they needed to defend it - and because breeding hormones hadn't kicked in yet. Now they've gotten used to the enclosure and the female is laying, meaning breeding hormones have started, and so trouble also starts. I'd remove the male that's hurt and see whether the hen is calling for him or seems content with the remaining male. It doesn't really matter who is the father of the eggs and both roos might have mated with her, so if she's happy with the aggressive one that will give the other one some time to heal while you either sort out a second enclosure for him and his future friend (they can die from stress if kept alone) or find someone that's willing to take him off your hands and give him a friend. If the hurt male seems very stressed being separated, I'd do as Binki suggests and keep him where he can see the others, until you can get him a friend.