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Please read this BYC thread which discusses what it may be and how to treat. Poor chooks... https://www.backyardchickens.com/forum/viewtopic.php?id=154581

I'm so sorry. I think three horses has explored the variables and that you were dealing with more than one thing. I'm very suspicious about the dead pigeon as well as the possibility of mold. Do you have room to remove any remaining birds so that this coop/run can be returned to a pristine...