What is going wrong with these chicks? So far we have only lost 2, but I don't want to lose more of them. They look fine, are walking around and chirping really loud, and then out of nowhere they get very lethargic, look like they are trying to puke, and then they have mucous coming out of their mouth and throat as they stop being able to chirp at all... this is rather strange and hard to witness... I NEED answers and help with this! Please!