This is a vertical box setup in my barn. If larger than a 5 x 5, our body grips have to be inside a building and off the ground. But concept is the same. To get in, they have to be pushing forward with back feet, while pushing up with front feet and leading with their forehead. Still, they can slither under that 4" opening faster than water. Watching them on game camera video, only concern they seem to have is while dining in private is Charlie sneaking up on them. They back out often.......check the perimeter around them and if all is well, go back to it.
Box is modified to include a bait shelf, and to make it easy to place the bait, the closed up end is hinged. It recesses inside the sides. They don't even try to open the lid. I found you only need thicker solid wood for top and bottom to screw into. Sides can be thin plywood like 3/8".
As an aside, entry into that barn is thru a split box stall stable door. Bottom half is closed, top half left open. The door is about 6 feet or so to the right. Coons will step off top of door to that box stall transition from solid wood bottom to metal top. They walk down the side of that box stall wall standing upright on transition top, holding on to the metal bar uprights with front paws. Kind of a jungle gym side to side move. Others will climb to top of the stall and walk down the pipe, coming down face first. Coons are incredibly agile.
But if legal, you can do the same on ground outside. Lash the box to a tree or fence post or anything upright. In addition a good neck strike, it eliminates almost all non targets.
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