We picked up eight new chicks of various breeds at our local TSC last night. One had a strange growth or scabbing on its rear that was hardened and looked about two inches long, one inch high, rounded. We thought it looked like congealed poop. It died before morning. Does anyone know what the scab is or what causes it? Is there anything we could have done? Should we be concerned about it spreading to the others? There is a second chick not doing well now, but it could be due to its tiny size. We are first timers. Thanks.