Whitefoot The Wood Mouse in "Making Over An Old House"

So back and forth from the ground to the old nest in the tree Whitefoot hurried, and presently there was quite a pile of weed stalks and soft grass and strips of bark in the old nest. Mrs. Whitefoot joined Whitefoot in hunting for just the right things, but she spent more time in arranging the material. Over that old nest she made a fine high roof.

Down through the lower side she cut a little round doorway just big enough for them to pass through. Unless you happened to be underneath looking up, you never would have guessed there was an entrance at all.