I feed my neighbors 3 coops of sad chickens. One coop is older chickens and 2 pathetic ducks and the other two are pullets. The younger ones started laying a few weeks ago. This AM when I was feeding them, there was an egg in the nest that didn't have a shell. I told the owner and she said they need oyster shells but they don't have any. Unfortunately the chickens aren't a high priority on their farm. They all hate chickens but like the eggs. I love those chickens. The younger ones are so friendly and let me hold them and pet them. I so want my own chickens but until then I have to placate myself with their chickens. What can I give them instead of oyster shells, if that's what they need?