We had 5 chicks in a brooder. We got 4 from a friend and we hatched one in a incubator. They have all got along fine. The chick we hatched was born on December 22. The other four chicks are about 11 or 12 days old. We have them in a cage that we have raised other chicks in. We have raised a lot of other chicks in the same cage and they are still alive and healthy. The water and feeder that we have in the brooder with them is brand new. I have seen them all eating and drinking. Today one of the chicks died. I found her laying in the brooder dead. We buried her and a couple hours later we found another chick dead. I looked over the three remaining chicks and they seem completely healthy. I looked at every part of their body and I see nothing wrong. One of the chicks constantly chirps as loud as she can. Is there something wrong with her? What caused the other two chicks to die?