11 Jan 2010.
Morrisville Levee, Bucks Co, PA.
Brief description of what you observed
Round white cheek patch
Upper right hand side of photo. I don't have my field guide with me at work. Doing some house cleaning on my older photos.
Goldeneye and Whistler are common names for a species of small tree-hole nesting northern hemisphere seaducks belonging to the genus Bucephala. The plumage is black and white. Goldeneyes eat fish, crustaceans and other marine life. The "Whistler" name comes from the noise their beating wings make in flight.