As close as these two would allow me to get. During the day we spent at Magee Marsh, saw this pair on two different ponds.
Nikon D800
,AF-S VR Nikkor 70-200mm f2.8G with TC-20 E II 1/500s f/7.1 at 600mm iso280
Free Crop of DX Image Reduced to 160 dpi for Internet Viewing
full exif