I keep a small brooder thermometer in the hen house to keep an eye on the temps and this morning I found it on the ground with the glass that contains the mercury missing. I've looked all over the hen house on my hands and knees and can't find it or any pieces of it. It's only about 4" long and very thin but I thought I would at least find pieces of it. I have 10 pullets about 2 months old and I know they peck at anything red. Could they have eaten it? Has anyone else had their hens eat glass? They all appear healthy and running around the yard as usual.