I went to the same park again today. I spotted a Fox Squirrel eating a pine cone in a tree elsewhere in the park, and a California Ground Squirrel standing guard outside the enclosure’s chain link fence.
Seriously, it. did. not. move. for several minutes while another ground squirrel ran inside the fence and waited, and I moved to a better angle for photos, until it abruptly turned around and ran through or under the fence.