help! two chickens found dead in coop: no signs of injury

[lyndseywilliams]

I really appreciate all the feed back! We inspected the chicken coop for weak spots and put out mothballs. This morning we still had three chickens. So relieved! However, still worried. I don't think they were killed from a snake bite, but rather strangling and then the snake attempted to swallow them. However, I'm not ruling out fireworks or coccidiosis as the cause. Trust me, I would be glad if it WASN'T a snake.
However, I have noticed some diarrhea, but no with no blood present. We've had the chickens for about 12 weeks now.

 

[Chicnextdoor84]

Very strange coincidence but we had fireworks at home Sunday night and Monday my favorite leghorn was lifeless on the coop floor she died not long after I found her and her crop was empty. Now I am almost sure the fireworks scared her and she broke her neck, it was very floppy and she couldn't hold it up at all. Everyone else is fine and I kept a very close eye on them yesterday. No sign of sickness or aggressions. I know leghorns are nervous and flighty, mine are always hiding in the coop even though they are not bothered by their flock mates. I am gonna miss her she was my favorite of the 3