My brother in law called me with a problem with his chickens. he has lose 4 in 4 days. And there is blood on the outside of some eggs. I have 25 chickens, kind of baby them. Feed them lots of herbs, and sprout their grains.. ya they get good food. I didn't know what was up. But on visiting him I saw that the wood chips on the floor were all wet, clean but wet from the rain before he put it down. Its been cold at night. They also didn;t sound good.. kind of cackleing... we figured out that the wet floor was so hard on them that they were freezing... he put a heat lamp in that night since it was late and put dry chip in the next day... wala no more problems.. guess that a sign of stress and cold... problem fixed.