[EBB Sightings] Lafayette Reservoir Nesting Boxes

I'm embarrassed that I can't ID this bird in my Sibley
guide.  I am more of a raptor and wader fan than
anything else, so I'm at a loss with these small birds
sometimes. 

Anyway, at Lafayette Reservoir on Sunday, I found a
pair of these little birds actively bringing nesting
material into their manmade nesting box.  They were
using one of the boxes that's about 25% of the way
around the trail going counterclockwise; it's off to
the left and down a slope traveling in that direction.
  They were very busy and quite entertaining.  The
pictures are here:

http://www.pbase.com/zeiler/image/42591215
http://www.pbase.com/zeiler/image/42591217

Thanks for the help,

Brian

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