I have a cage of Seramas that have suddenly started dying. Some of them have diarrhea but not all of them. They appear to be normal. Then quit eating and drinking and die within a few hours. These birds are inside and not exposed to any outside disease. There is no blood in their stool. I have three cages of them in the same area and only the birds in this one particular pen are the ones that are dying. None of the birds in this pen seem to be eating well. All of the birds in all of the cages are fed the same feed so it's not in the feed. What on earth could be going on with them. I have so many birds it really worries me it is something that could spread to all of them. I could use any help or suggestions you might have. What on earth is this mystery disease?