Hoping all of you experienced chicken peeps can help me out- One of my hens became ill last week. Her symptoms included difficulty walking (due to balance issues)- She was stumbling around and sitting down on her rear end a lot to get her balance. That eventually ended up with her just sitting period. I quarantined her immediately and had hopes of a recovery- She was still eating and drinking and was very alert. She lived 3-4 days like that before passing. Went out to let my flock out last night and noticed another hen exhibiting the same exact symptoms. Her posture is noticeably "upright" with her rear end close to the ground. Very very worried that I have something serious going on here that could wipe out my flock. Any advice is welcome please!