Dan I do not have a clue, I don't know who your little citizen is...but to show you my good intentions, I am attaching this photo of a pika! They like to live in the rocks, and they whistle!
When I lived on Mt. Baker, in the Cascade Mountains of Washington State, I would see these little fellows often and I liked them. As I was searching for the photo, my heart sank because it appears they are now becoming endangered.