I have two roosters that stay in a large fenced area with 6 feet fence hight and one foot in the ground. Sometimes the door of the coop which is in the fenced area is open. Last night I heard screaming at 3 am. I got up and shouted out from the window and screaming stopped. I rushed out and it was quiet when I went to the coop. I found one of the rooster really scared and snagged in a corner and all of his tail feathers was gone and I found the other rooster completely eaten up. Only the head, wings, legs and the large back bone (cleaned out of every bit of meat) were left. His head was separated from the body and seemed intact. I run out in less than two minutes after I heard the scream. I think one was eaten already and he was chasing the other one. I am wondering what it is. It must be a really good climber or it is very small that fits through a 1.5 inch opening. I did hear a dog barking at distance.There are no signs of digging under the fence but there are some bushes leaning against and over the fences in one corner. Entire place was full of feathers in the morning. I brought the surviving roster into the house and I am worrying to put him out before I figure out what is going on. I would really appreciate any insight as to what type of predator this is.