Rats? Racoon? What killed my young chicken? (Pics may be considered graphic)

[McChooky]

Update?

 

[ronlong1]

In 3+ years, the only predator to get into my coop was a cottonmouth. But this morning, when I opened the coop, I found 3 young (2 1/2 months old) chickens dead. 2 were clearly killed, the 3rd may have died of a heart attack or broken it's neck in a panic.
The 2 killed were laying where they sleep, in a corner behind the wire crate I had for when I first introduced them with the big chickens. (Some still sleep in it.)
One had all of its head and neck and one wing eaten, the other was missing its head but the neck was intact although featherless. The 3rd bird looked completely fine, no wounds, no missing feathers, just dead.
I did notice that a corner of the hardware cloth that covers the gate was out of place, so I'm replacing that damaged section today. That could have created a gap maybe 4 inches.
The other 9 younger birds who still sleep on the ground, as well as my 4 Peking ducks, were all unharmed. All the rest of my chickens roost high - 5 - 8 feet up.
We have killed 3 rats in the last 6 months, and found a cantaloupe in our garden partly eaten with what looked to me like raccoon claw marks in the skin. So, those are my 2 beat guesses.
Thoughts?
Oh, and we have a rooster who sleeps outside on a 3 foot high wooden bar, and he was not touched.
Putting out a game camera tonight.
View attachment 3974406

sounds like a chicken hawk

 

[HeidiGretchen]

Update?

I never caught anything, so the mystery remains. There was 1 follow incident where I got home a little late - maybe an hour past dark- and all of the chickens and ducks who sleep on the ground were outside the coop. Something had apparently gone in and they scattered. None were harmed, although I had to search for them around the yard. No issues since, thankfully.