This morning when i went to feed the flock one of my 9 month old cockerels was dead, a week ago same thing, another cockerel from the same hatch was dead. i have two hens from that hatch that still seem to be in great health, i have 1, 1 and a half year old rooster, and one more 10 month old cockerel. I also have 12 hens. Neither of the dead cockerels had any noticeable damage to them, the first was missing some feathers, but neither had blood or anything like that. I have been sneaking out to the coop at night and have not seen any predators, nor any sign of predators. Because both of the dead chicks have been cockerels i think it might be my older rooster getting too carried away proving his dominance. But around me and my wife and daughter he is the most friendly of all the chicks in the coop, and does not act territorial like a typical rooster. I guess the two questions i have are: What does a chicken look like if killed by another rooster? and Should i get my 10 month cockerel out until he is bigger? any advice would be appreciated.