This gray treefrog (Hyla versicolor) was making use of an abandoned nestbox at Hidden Valley. When I first approached, the treefrog crawled further back into the box, but as I stood there, it crawled back to the front and stuck its head out. Its markings blend into the box very well.
A few bugs I have not identified were hanging around the entrance to the hole. I imagine they would be best advised not to go in.