After staring at this active wren for quite-a-while, I captured several images; I hoped it was a Rock Wren, but under close scrutiny, I'm going with House Wren.
Best viewed in 'original' size.
Nikon D800
,AF-S VR Nikkor 70-200mm f2.8G with TC 2.0 E II 1/250s f/5.6 at 600mm iso400
DX Image Cropped 5x7" Landscape at 300 dpi and Size Reduced for Internet Viewing
full exif