Hi all. Went to gather eggs last night to find that I had four broken eggs in the nest boxes. Not just slightly cracked or even one tiny peck hole. They were demolished with every bit of the yolk/white devoured. I have a flock of 23 birds - 10 layers, 12 pullets with a few of them laying, and 1 rooster. Aside from process of elimination by isolating a couple of birds a day until the egg breaking stops, how can I figure out who is doing the dirty work? I looked for some dried yolk on three birds that I suspected as culprits, but that provided no evidence. Could the rooster be responsible (trying to prevent competition from entering his lair)? I put out some more oyster shell last night thinking this might also be a calcium deficiency thing. Any help/advice is greatly appreciated. I hate wasting/losing eggs, as I'm sure all of you do too. Thanks in advance.