I had a grown hen do the same thing for a few days. then she stoped. now i have a young pullet doing it. dont think it is a voice change. cause the older hen did the same thing. wonder what it could be? i remember the older hen looking a little sick and not comming out to play when she was doing it. now the pullet is doing it. but at least she is moving about. she keeps her mouth open all the time then makes the strange honking sound. any ideas?