Merriam's or Ord's.
This little guy was clearly comfortable just hanging out an eating his nut while being photographed.
Running on a dead tree small and cute
I saw this little guy out on my back patio playing in our "fire wood" (a bunch of limbs and twigs).
I tried to get a better photo of him, but he ran off when I opened the storm door.
He seemed to be cracking open a nut of some sort.
He looked like an average sized chipmunk. He was tan, with white and dark brown stripes.