What kind of predator

[Paula Maples]

Today I found 1 of my chickens in the coop dead, head was missing so was her insides. Nothing went through the run and the top is covered. I do have a gap where the run meets the coop, but what ever it was has to be climber cause it's off the ground 3 ft.

 

[cavemanrich]

How wide is the gap in question, a pix would help us identify the problem and possibly offer a solution. Most predators can climb, especially a short height like 3 feet.
I know you just joined today, so you do not have your location in your profile, or your post.
Lets assume you are in North American Continent.
A raccoon is a possibility, biting the head off, but usually eats more than just the inside.
An opossum, does like to eat the inside , from the bottom on chickens, but usually does not bite head off.
If you have weasels, fishers, or mink, I'm not sure how they eat their victims.
First, and foremost,,,,,,,,,, secure that open gap so you do not loose any more chickens. Predators are known to return where there is a supply of food.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, and

 

[gtaus]

Welcome to the BYC forums

I just have 2X4 welded wire fence for my chicken run. So things like mink and weasels could get through pretty easy. But I lock my chickens up every night in a Fort Knox coop that nothing should be able to get in. My suggestion would be to fix that gap you mentioned but concentrate on fortifying your coop from all predators. Once a predator finds food for the taking, most likely they will be back and probably with friends and family next time.