I have had two chickens die in the past couple of months. Both of the same thing. The first one I thought was just old age, but now I don't think so. The vent is clogged with poop. We cleaned her off with water to make the vent open again. The smell was horrible. They both separated from the flock and would squat making a clucking noise and action like they were trying to poop. Once you clean them off they just sit there, but not like they were in distress anymore. The next morning, both times, they both acted like they were fine. The first one died that afternoon of the second day. The one that just died a couple of days ago, was fine the next morning, throughout the day she got clogged again. We cleaned her vent area with water so the clog was gone, still a horrible smell. She hid from the rest of the flock the rest of the day. She died overnight sometime in the coop. What is wrong with my chickens? They are free range all day and put up at night in a coop. The one chicken was over 4 years old and the second one was about 2 year old. Any help would be appreciated. Thanks !