Today I go to let my chickens out, and I see one hen having difficulty walking. Her legs don't seem to be listening, and she keeps tripping, crossing her legs, and falling over. It looks like shes really weak. She is also panting. I see her still eating, but haven't seen her drink yet. She lays down a lot and looks like she is dying. What could be the problem? The only thing we changed was their bedding, we bought shavings from the feed store that the woman said was pine or hemlock? She said most people use that for chicken bedding... could she have ingested some of it? It could be unrelated.. I really have no clue what it could be? A disease? An injury? I don't know...What does it sound like it could be?