I did my masters research on this species over 30 years ago, so I have a soft spot for them! This bird is in its winter or "Basic" plumage. Note the dark flecking around the head. Adults have a nice yellow bill even in winter.
This bird was looking for handouts at a local pond in Sackville, NB.
I lightly cropped, ran NR on BG and colour-corrected in LAB mode with Curves attempting to get whites close to 0,0.
Canon EOS 40D, 500mm f4, 1.4tcII = 700mm
capture date: Sunday, October 26, 2008 3:39:25 PM
exposure program: Manual
ISO speed: 400
shutter speed: 1/500
aperture: f8.0
exposure bias: +0.0
metering: Pattern
flash: OFF