I have lost three chickens in the past 48 hours. It has been extremely hot but the coop has afternoon shade and they have access to a run which also has afternoon shade. They have been hanging out in the coop a lot more than normal so I don’t know if maybe there is a predator near that has them scared. There is no apparent injury and they have all been very healthy to this point. I have been feeding them watermelon and regular chicken feed. They are laying hens about 10 months old. Can you give me some ideas of what to investigate or how to help.