I did a search and read other posts of hens eating charcoal and it's ok for them as long as it's from hardwood with no paints/varnish etc. and never charcoal briquettes for grills. But what I'd like to know is why do they like it?? I had the 3 older (21 months) hens in the garage for awhile to hang out (yeah i'm wierd) and they went by the wood stove and found bits and pieces of coal and acted like they found the best treat ever! just curious about it.