We’ve been visited by a Ghost Chipmunk. We can see a hint of normal Chipmunk red-brown markings through our visitor’s white fur. It's not an albino, it has a partial loss of pigmentation (leucism).
Brief research indicates that this white rodent is a rarity. Here's an image of a normal Chipmunk followed by several more of our Ghost.
That research also indicated that the strange name “Chipmunk” may have been a phonetic spelling or corruption of the Ottawa Indian word for the animal: Jidmoonh, meaning red squirrel. Wonder what the Ottawa Tribe called the larger rodent that we call a Red Squirrel.