So we started out with 8 chickens the past summer, and now due to marek's we are left with 6. Today, I picked up one of the roosters, and I noticed his breast bone is very sharp, and that he is really thin. He seems to be alert and eating, so what could it be? Could he be the next victim of marek's? Or may there be another reason? He's always been tiny, not sure if its his breed or if he's just some sort of runt. I watched him walking around and he doesn't seem to have any problems moving or walking. Any ideas?