Chickie'sMoma: Sorry for your losses. These chickens sure are easy to get attached too, especially the ones that make such effort to get close to us. We can only do our best for them & I'm sure you did.
Last weekend, I noticed a small hole leading into my perimeter ground & roof wired, chain link fenced chicken yard; it's also inside our field fenced back & front yard. That same day, I read some things about blk snakes & have been reinforcing the coop roof, coop & yard everysince. For the first time living here in the forest for over 15 years, we've had numerous coon visits in the backyard. The predator reports have been coming up a lot this time of year it seems. Best wishes.
In addition, I sprayed some animal deterent spray around my fence lines, contained my garden scraps compost pile & a few days later got a night movement sensor light going. Haven't seen any sign of the coon since, wish me luck.