Sibley Volcanic -- Rose-breasted Grosbeak
A singing male has been at the location since 6/3, and only been reported to eBird.
The bird is in the ravine on the northwest portion of the Loop Trail. The trail dips where the ravine crosses it. This is near it's junction with the Quarry Trail.
The first report was by Elliot Chasin on 6/3:
Reports on 6/4
And today on 6/5. The reports neglects to mention that the bird was photographed by Mark Rauzon.
Michael Park, Berkeley