I saw this little Rock Squirrel on my lunch hour walk at work today.

According to DesertUSA.com "Rock squirrels are one of the largest members of the Scuridae family,
growing to nearly a foot in length, not including their long, bushy tails which are nearly as long
as their bodies. In front and on top, their coat is a speckled grayish-brown; in the back, and on
the bottom the gray becomes a more mottled brownish black tone... When alarmed they
whistle a short, sharp oscillating call."