I was watching up in the tree as they (Cal Poly students and Oak Ambassadors) were filming, and I was treated to this white-breasted nuthatch show.  I would guess that there might be some nest building going on.  The white-breasted nuthatch is a cavity nester.  So, some of the holes that we have been watching should be a home for some new baby birds this spring.  The nuthatch was actually traveling down the tree, but it seemed easier on the eye to rotate the photos.  

Shared by LATO docent Mike Klatt, March 13,2014