This pair is busy (female does all the nest building); male inspects and keeps area clear of intruders. This is her 3rd nest in the very same box this breeding season.
Nikon D800
,AF-S VR Nikkor 70-200mm f2.8G with TC-20 E II 1/320s f/7.1 at 465mm iso800
DX Image Cropped 5x7" Landscape with Size Reduced for Internet Viewing
full exif