I deal with coyotes on a regular basis, I am a trapper. If a coyote sets tooth to a chicken, that chicken is not going to be found. This time of year, coyotes will kill what they can fit in one's belly and carry in the mouth. They will take them back to the den to feed the pups and nursing female. Later in August or September, in a pup training foray, they might take the whole flock. Coyotes that depend on chickens and have anything more than just a random schedule are either denned very close or have some sort of disability preventing normal hunting behavior. Normal hunting behavior for coyotes might cover several square miles, eating a variety of prey species, they might only come through once a week.
Foxes behave in the same way, but they will make multiple kills and cache them, somewhere near the den, buried in dirt and leaves to keep for later. They might kill a couple or more a night until the chickens are gone, or until you kill them. All but the biggest, fiercest roosters will be gone if engaged by a fox. Sometimes with fox you will see a feather trail, as they can do a bit of struggling, and aren't carried as high off the ground as when a coyote takes them.
Is it possible your roosters got in a fight and you have some hens off broody somewhere?
I did wonder briefly if the two biggest roos had fought each other. But four other chickens disappeared, two roosters and two hens. They are all very subdued now and sticking close to the house where they can run under the porch. I wish i knew more what to do with the injured ones.
We know there are foxes here VERY close. And we have heard coyotes in the national forest adjoining our land. So i dont know which did this. No problems at night, only daytime.
There are lots of coyotes in the next county where many people raise sheep. It sounds grose, but there is a man there who has a coyote tree. He hangs them in the tree i guess to scare off the others.
Before i have only lost the occasional chicken and didnt find feathers. But this time there was a mess of feathers from one or both of these injured roos. They are the same color.
Thank you for the info.