We had seven hens in our coop/run which are about a year and a few months old. One died about four months ago of unknown causes. Another died two days ago and another yesterday. They had lost a lot of feathers, but the one that died yesterday had not lost any feathers. In fact, the day before, she looked and acted ok. We are at a loss. We didn't change feed. They have fresh water, good shelter, are good egg layers. There wasn't anything about them alerted us to any sickness. No animals are getting into their coop/run either. We can't afford to take chickens to a vet either. This is our first 'batch' so we're learning as we go. What could cause them to die so fast? I fear I will lose them all before long and have to start over in the spring again.