Tide pooling at low tide.
San Miguel Ranch, San Diego County, CA
Sweetwater Reservoir, San Diego County, CA
Salt Creek Recreation Center, San Diego County, CA
Found in the same spot with some bones of other species! This observation is the same as the bone on the bottom left here https://www.inaturalist.org/observations/95461151
Thank you @tfrench for identifying this as the distal end of the right humerus belonging to a bird
What species of bird ?