I lost one of my layers today. They were all in the run (1x2 welded wire fence with bird netting over the top) and I found one up against the fence minus a head and some chest feathers pulled off scattered outside the fence. Looks like something ate on the neck and chest. The roosters crow so much that I don't go checking every time I hear them, unless I hear something unusual. Actually its the opposite. Kind of like with kids. The sound of silence is more disturbing because you wonder what they are doing. Anyway, after looking around, nothing dug under, nothing got through the fence or netting anywhere. Definitely looks like something pulled her from outside which leads me to believe it was a raccoon. So why would a bird walk up to the fence with a coon sitting right there? Are they not naturally afraid of them? Obviously not. I live in the woods and I've seen my birds out of the run foraging when turkeys, deer, and barn cats come strolling through. They pay these animals no mind. I've seen the rooster chase off the neighbors tea-cup Chihuahua, they crow when hawks circle overhead, they crow where squirrels climb in the trees. For some reason they don't worry about the cats. So now, after witnessing a raccoon kill a bird, would the others now fear it if it were to come back? I some how doubt it. They haven't seen a hawk kill any of their number, and they seem to fear hawks. I guess this incident has me more interested in a chickens cognitive learning ability and survival instincts. Also, I wonder about my roosters crowing. They make the "cock-a-doodle-doo" sound all the time. They do that when hawks are circling, they do it when wild turkeys wander through, they do it at midnight, and all day. The only other sound they make is a deep clucking sound when they find food and call the girls. And that call is the only call that it seems like the hens respond to. The hens are about a year old and the roosters hatched last May. Is warning the flock something they still have to learn?