I cannot rodent proof. I keep trying, though.
My broody hen got off the nest today - I took her out of the box and took the box out of the coop and she picked right up with the other chickens like nothing happened. Then, tonight, she was on a crate in the inside coop looking where her box belonged. So, I put it back, she hopped back in. I took an egg that was layed today by another hen and put it under her . . . I also noticed today that yes, the Rooster is "active" so my eggs are fertile. Right?
I hope the baby opossum made it back out! They usually hang on to Mom at that age, literally.