It is amazing what we will go through to protect our flocks. A friend of mine raises parakeets. She put 12 inch square concrete stepping stones on the floor of her pen, wall to wall along with the hardware cloth and has never lost her birds. Of course, they would be harder to catch than chickens but seems like a good idea. She just hoses/scrubs down the floor of her coop when it needs it. The wood frame was built around the blocks so they couldn't shift. I am like you all in that I would go to great lengths to protect my poultry.Growing up we lost several flocks of chickens. It is very traumatizing as a child to go to collect eggs and find all of your hens dead. The predators were weasels. They can fit through a tiny hole. It took me 25 years to get over my anxiety and get some chickens. We live on mink road and have mink run creek behind us. They are cute, but they are also relentless killers. Our house is also in the middle of a state park that has every other predator known to man. My neighbors loose their chickens all of the time. Hawks, fox, coons, snakes, coyotes, etc. Chicken wire is useless against predators. They can rip it open like it's paper. We built the coop and run with every predator in mind. We dug trenches around the perimeter of the run. Burried hardware cloth about 2 feet deep and covered with a foot of modified stone. The run is samwiched in between two buildings, a paved driveway and concrete walk. It would be difficult for something to dig in. If they would mannage to dig under the drive, walk, or building, they will run into the Burried hardware cloth. The entire run is covered in hardware cloth including the roof. The door to the run has three latches (2 different kinds) for any smart coons. The coop has an automatic metal door that goes up in the morning and down at night. Coop is inside a building with tile floors and walls that are over a foot thick. That is also covered in hardware cloth in case something could get in the building. We keep the food in the coop so we don't attract any animals with spilled feed. So far so good. I check the run daily for any signs of a predator. Yesterday there were 2 huge hawks checking out my girls. They killed my neighbors rooster and hens last week and are looking for more. A fox just got all of another neighbors out free ranging in broad daylight. I don't want to relive the horror so my girls are locked up tight.