Snakes absolutely. Raccoons will reach through and grab chickens and pull them close enough to the fence to bite off whatever they can reach. Were the victims up next to the fence or in the middle of the run? Minks and weasels can fit through that too I'd imagine.
I use electric poultry netting to contain everything. It is portable and moveable, make sure you order extra stakes. It uses pulses of electricity. My kids know better than to touch it but if you do it is a nice little zing not really enough to hurt you. The goats and dogs respect it and the only predator we've had was a hawk that slipped under a pen's netting and was trapped there. I don't have access to my pics on the tablet but I will share one later.I'm certainly no expert but I can think of lots of animals that can squeeze thro thatthat being said my bantams have a run with that fencing, but their coops are super secure with hardware cloth and we've had zero predator problems. Plus my Pyrenees spends a lot of time in the run because he takes off otherwise and I don't want to turn on the electric fence which is around 1 1/2 acres for the goats. Thankfully our goats don't try to jump it. Which reminds me @lonnyandrinda do you use electric fencing for your goats or chickens? I know you have lots of kids so I'm wondering if you've found a worry free way to use it? I'm thinking I'm years away from being able to turn it on and this Pyrenees does not listen to me and the bantam run is not huge. I'm about to try a shock collar.
Will do how awful. Prayers that he will be found safe and you can get him the help he needs!Please keep us and our son in your thoughts and prayers. He has been suffering with major depression for the past year or so. He is also autistic. He withdrew from college this week without letting anyone know and has now disappeared. He hasn't used his phone or his bank account for 5 days now. My dad saw him on Tuesday but that was the last contact anyone had apparently. We are in panic mode.