This afternoon as I was changing out water and feeding my 8wk old chickens (they are in a brooder indoors), I found one of the cockerels dead and blood spots- almost like clumps/clots- through out the brooder. One of the other birds had some blood on it's feathers. the blood seems to be droppings as the dead bird had no injuries and the other birds have no injuries. I just checked on the other birds again and there is fresh blood in the brooder. What is happening!? They do have wood shavings as bedding, but are old enough to not be eating them.