We had a spike last night up to 58%. I am sure it was not for along time, maybe an hour or two at most. I am constantly peering in the window and it has been hovering between 44 and 47%. So we cracked the lid and vent and got the humidity immediatly down, and it was still at 47% this morning at 6am. I have checked in many time this morning and it was fine. Just did another random check and it was at 34%. We added some water and set the australorp eggs and will see where it goes from here, but why would we be getting swings like this. It has been so stable. I know too high a humidity can drown the birds. Do you think that spike could have killed them??? And what happens to the chicks when humidity drops? Thanks, Suz