So, I've been hatching and raising chicks of various kinds for as long as I can remember, I've had everything from chickens and ducks and geese to rescued songbird chicks. During this time I've had the occasional death, even outbreaks of, a strange and usually fatal illness. I'd like to know what it is, or likely is, so I'm going to put what I can tell of the symptoms below and see if anyone knows. I usually notice it suddenly, one of the chicks is being very lethargic and won't really move to eat or drink. Perching birds with this sickness lose the ability to perch and are forced to sit on the floor of their cage. As time goes on, they get weaker and weaker and seem to have neurological problems, until eventually they die within about a day of first signs. They usually feel abnormally cool before dying, and sometimes there is discharge from their beaks. I've had several with this, most recently an outbreak in month old chicken chicks, and before that in some of my other chickens and song birds, none of which were kept together, besides those in the outbreak, and even then there were survivors that were completely unaffected, and one chick that I managed to nurse back to health -though she escaped the brooder and may have just been cold, it was the middle of winter in PA. Age also does not seem to be a factor, as I've had it in adult birds as well as chicks.