Birds in tree are in high risk setting for owls. Get them in. Consider having them roost in big tank if predator does not appear to go up in it.
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Very good video and pictures. A raccoon can climb up on the six foot coop with little effort as could a opossum. Many of the rafter areas will be accessible to a raccoon as well although they are not good at thinking through indirect routes. Birds high up are relatively safe. Did you clean up the kill sites?
Consider redeploying the poultry netting so it actually surrounds the barn. Also place traps close to where you think predator must go to get at birds. A preference I have is to place traps along a wall or near a structure that raccoon might want to climb.
Could you go out and check on roost locations tonight? Look for birds in locations a very agile five year old kid could get to and where jumping need not cover a distance more than 48 inches. Some kids can climb those walls and get up to the rafter where catching a chicken is a cake walk.
I have been having similar issues with owls coming in so each evening I checked for chicken roost sites and then made adjustments to those locations that made the owls job more difficult. In some situations that involved making the chickens efforts of helping the owl more difficult as well.
Possums are not climbers, I put my trash in the back of my truck and they won't even go in there and it's a small truck with the tailgate down. I was losing chickens once and slept overnight in the barn and I caught two raccoons up in the rafters 16ft high, walking across a 2X4 to get to my chickens. I should mention that my barn was 50ft wide too. So they went along a 2x4 for almost 50ft.
Raccoons will also pick a spot and use that over and over to poop. Mine picked the loft of the barn. Was a real mess.
I used cans of tuna packed in oil to catch the raccoons. I covered the cage with straw to camouflage them. I caught 15 raccoons I think.