We have two species of chipmunk that could realistically be found in San Diego County, Merriam's Chipmunk (
Neotamias merriami) and the California (or Chaparral) Chipmunk (
Neotamias obscurus). Apparently these two species are very difficult to distinguish in the field, but based on habitat type and behavior, I assume that the chipmunks in my area are Merriam's Chipmunks.
Since the Cedar Fire (in 2003) the chipmunk population has increased quite a bit on our property and the surrounding region. On a typical morning 4-5 chipmunks might be seen foraging on the land near the house. We have a mixture of open "grassland, chaparral and oak/pine forest here, which is ideal for these chipmunks.
They forage most actively in the morning, so that is when I try to photograph them from the blind.
Here are the photos from this morning (this was a single chipmunk, which vocalized loudly before appearing).