As in - who even knows. We moved our chicken family to a new, 6 acre place. As in the old place, they are fully fenced and covered with bird net. I take no chances besides, we have official resident in form of American bald eagle. But, place being in farmland, we have all kinds of burrowing critters. I know rats, mice, weasel and possum. Reason I know this we lost a bunch of quailes to rats (taken care of, steel mesh now fully covering the quail thing) and then I trapped 3 rats and a weasel. Several mice. 1 possum and 1 died in property. It's been a while since I trapped something, but burrows keep showing, ground under the chicken coop looks like one big burrow land. We had no losses - yet - but I'd rather put at least a reasonable end to this. I have TomCat large poison dispenser outside the run, type that only rodents can get in, but it is not apparently frequented by them - blocks are almost untouched. I lock chickens inside coops for the night but I know that hungry predator may graze through boards too. So far, rat traps worked best. Any other suggestions? Flock is quite a bit away so if something attacks them mid night, we won't even hear the noise. Yeah, a guard dog makes sense but then I have to break the wall called my wife's mind, set on NOT having a dog for some reason. Or cat, for that matter. She just "got that thing" about dogs and cats. No idea.