Something is getting in the run.....but how

I predict you will find a hole in the chicken wire somewhere. Probably up high.

 

I'm new at this, keeping chickens. But I have read that chicken wire is not a safe enough fencing because coons can reach thru. Possibly they are reaching in and getting them?
So sorry btw.

 

Or it's a weasel their MO is to bite the neck and drink the blood in any case you need to catch the varmint and kill it as it will keep coming back. As @Tortoise mentioned the function of chicken wire is to keep chickens in not to prevent predication. Examine your run closely for any openings. Add a hot wire to the outside to keep predators out. Use the chicken wire as the ground it's very effective that way.

JT

 

Agrees...could even be an overlap that can be pushed thru but not look like a hole.
Looks for tufts of hair.
Is bottom of mesh, where it meets the ground secured?

 

I am dealing with something similar. In my case a skunk pulled away a section of the hardware cloth I have under my coop. I think a weasel went into the hole the skunk made under the coop and then into the run. Weasels can get in a very small hole.

 

Hardware cloth is much more secure replace all chicken wire as soon as possible I am so sorry you lost the ones

 

I would say smaller than 3/4 inch looking at the size of the skull.
So it would go right though the chicken wire. Although they are usually nocturnal.
Rat trap in a box with a small hole! You could just leave iteven in the coop or where ever, the chickens couldn't get it. They are xurious and like dark holes...

 

So sorry for your loss! How sad. Best of luck with the coop/run modifications!