Here's a strange one; yesterday and this morning a caught a few of my chickens picking and eating the styrofoam insulation that is between the outer walls of the house and the vinyl siding. They are going up to the side of the house and reaching up under the siding to pick at it. This is frustrating as I have to find something to block them for eating it but in the meantime if they do eat some, will it cause harm ?
I found mine eating the paint off the side of the garage door jam. They started doing it at the same time they started laying so I guessed it may be a calcium deficiency. I gave them a cup of crushed oyster shells (they'd been getting layer feed and crushed egg shells already) and the paint picking stopped. Don't know if it was just coincidence.