I just purchased a few hens from someone, and found out one makes this strange noise when breathing mostly when her mouth is opened, like when it's hot. Kinda sounds like when your sucking a straw and just finished your drink. (Sorry) It's like there is fluid in her windpipe? I can hear it moving as she breathes. I asked the person I got her from and he forgot to mention it. Said she's been doing it since she was a month old (she's 12 months now). Claims it's from ammonia toxicity. Said her and her sister both got sick at a month old and she has been making that noise since (Bit my tongue). Anyone know anything about this? I was offered a refund, but said it was okay as long as she is not sick, also none of their other chickens have this.