Look I know that the girls like to lay their eggs in a nice safe & secure environment but do they all need to covert the same nest at the same time? Chickens will of course always look for a safe private (to them) place to lay their eggs and as each egg they lay is potentially a baby chicken, so when they stroll past a nest and see an egg (or hen) in that nest, they think that since another hen felt it was a safe place, it must be a safe place for their egg too.
Alana Moore mentioned in her book that in a flock, all the laying hens will sometimes lay their eggs in a communal nest in order to accumulate a 'clutch' which one of them will then sit on to hatch. The faster the clutch is completed, the sooner the hen can start sitting, the more fertile the eggs and the better chance at hatching them. Somehow though I don't think this has been the cause of our war here.
(Now, remember in the world of the chicken, whether or not the eggs are actually fertile and whether or not there is even a rooster in the flock is irrelevant and doesn't figure into their reasoning at all.) Hence all out war can ensue and they can get fairly loud & heated not to mention be quite destructive too when the eggs start to get broken. Broken eggs not only means that your egg yield is down but in some cases can be the beginning of hens eating their eggs (something you don't want to see start) and of course something else that sometimes occurs, the hens start pecking at each other which can cause injuries and if it goes on long enough even death.
The past few days one of my girls has been going ballistic every morning and even yesterday afternoon, Initially I thought she would stop but she didn't as each day she has become even more aggressive about the whole situation and I noticed yesterday that none of the other girls would go near the nest boxes in the afternoon. Oh dear - all out war has begun at our place

Friday I blocked off their favourite nest box, oh dear

Also hopefully by blocking the 'favorite' box for awhile and forcing everyone to choose another box it will help them realize that yes, they all are identical after all!
