[EBB Sightings] Red breasted sapsucker

Are red breasted sapsuckers common in our area?  We have one in  our 
backyard in North Berkeley on Oxford St.  There is another woodpecker that 
hangs out with it.  That one has just a red cap, but I haven't been able to 
get a good look at it.  Also, my neighbors say that after these two leave, 
a yellow headed bird comes for the sap.  Haven't seen that one yet at all. 
Also, I'm pretty sure we have white throated sparrows and a Bewicks 
wren.  On the latter I don't see any white on the tail though.
M. Miller