14 dead chicks found in coop!

[Penpal]

If they pile up you need to make a curve at each corner, which will spread them out more. You can also put up barriers so that they are in groups too large to suffocate each other.

 

[Project Blue]

I think it might of been a predator. The one chick's back looks denuded in your picture. I doubt it was the cold, especially with so many chicks. I have a transition coop with very small holes in the hard wire, I was also thinking it was predator proof until it wasn't. My problem was one dead chick but had others missing a toe. There were tracks underneath the coop that I thought were armadillo, but later I caught a small raccoon trying to reach through the 1/4 inch openings. Apparently either his tongue or fingers could get in just enough to pull off a single toe, and in one case denude one side of a chick. Your wire openings look bigger. It could be something else entirely, but look for tracks. I set up a couple wildlife cameras and nightly get dogs, and cats and more rarely coyote and other wild life but every single night some kind of predator checks the coop for an opportunity.