I have a hen, (not 100%) sure of breed. She's a rescue bird. Everything about her is perfectly fine. She's NOT fluffed up, she's eating normally, no runny nose or eyes, her crop is soft, she has no injuries, & she's a healthy 8 pounds. Today she suddenly started breathing heavy & her tail is pointed down. It looks like it's a little uncomfortable for her to walk. She still eating & drinking normally, her poo looks normal, & she's still pooping, but not a much as normal. She's 9 months old. I have her in the house now where I can keep her warm & calm.