I'm posting this on my sister's behalf 
My sister has a small flock of silkies, about 15, and a few have died over the past few months. NONE have had any symptoms of any kind, and they have access to unlimited fresh water and feed, and it's not been too hot lately. She just goes into their coop and the chicken is sitting with its head under its wing, already really cold and hard.
What do you guys think it up? Oh, and their poop is normal too.

My sister has a small flock of silkies, about 15, and a few have died over the past few months. NONE have had any symptoms of any kind, and they have access to unlimited fresh water and feed, and it's not been too hot lately. She just goes into their coop and the chicken is sitting with its head under its wing, already really cold and hard.
What do you guys think it up? Oh, and their poop is normal too.