I've read that rats can jump up to three feet vertical, so I don't what to make it too easy for them to get to the box. I have put various chickens in there; today I got one to stay in for a minute or so. It's about as high as they roost, so I don't think getting up is the problem. I may...
There is a trimmed 2x4 on the mouth of the box. I have fake eggs in there. I put cinderblocks in the old nesting boxes to keep them out, but the hen just nestled up behind. Moved the blocks closer so we’ll see.
So here is my quick and dirty. I used a plastic trash can, cut an angle out of it, then screwed it to a primed 2x2 plywood sheet screwed to a post in the coop. We'll see if they like it. I am concerned it might not be deep enough.
Thanks for the help. Was planning on letting the chickens out every day, laying hopefully in the rat proof nest. Hopefully the rats will lose interest and move on.
We have a rat who is stealing our eggs. I cannot seal the coop. I was thinking of putting nesting boxes on rat proof poles outside the coop. Has anyone done this? What do you think? There is not room enough on the coop to put such a nesting design, so it would have to be outside.