We have 16 pullets that just turned 5 months old. Three of them started laying eggs last week. Another two seem to have started this weekend. Last night we got an egg with no shell. It seemed the membrane was strong enough to avoid a puncture, but there was nothing 'hard' about it. It was just a soft, leathery egg. Anyone know what this means? I'm hoping it is just a part of the maturing process.