All my chickens appeared perfectly healthy yesterday, then I found one of my 4-month-old Barred Rock pullets dead inside the chicken house this morning when she didn't come out with the others. My husband said it looked like she had a little bit of blood on her backside. Other than that she looked fine. I know it's not really possible to diagnose from a little description and no pics. I'm just wondering if any of you experts might know something I don't, and if there's anything I can look for in the rest of my chickens to see if they're okay? I'm really sad about it and I wish there was something I could have done better.