I live in Maine to begin and I’m new to raising a flock. That being said here’s what I know I spend a lot of time with my flock me my son and my wife take turns caring for them. We had 10 birds buff opingtons and a couple pairs of other breeds I forget the names. 4 days ago I went to check the feeder and water and one was in the corner not moving she had passed over night . So today I did my normal check feed and water check for eggs ect . Everything seemed fine I have a raised coop and a outdoor caged in area for them. Typically after it snows I get inside and shovel the area for them and lay down some hay and open the door. They always come running out and peck around for the day. After about 3 hours today I checked on them and one wasn’t looking right she was not responding like she normally would so I brought her into the house. She was very sluggish and would not stand. I noticed her crop was enlarged the size of baseball maybe a little smaller. So I started reading up on this and found a couple ways to help her . She would not drink or eat I started slowly giving her water with a food injector without the needle. Tipped her upside down and brown liquid poured from her mouth. After hours of reading and sitting with her I noticed yellow diarrhea. At the moment I didn’t realize the major problem I had . About 5 hours later I checked on her and she died right in front of me. So now I’m a little freaked out and concerned about the rest of my flock. Any help would be much appreciated