After reading Michael Lester's post yesterday about the  
canvasback/redheads he'd spotted at crown point, I decided to take a  
trip out there this morning to see if they were still around. Sure  
enough, they were there, mixed in with a  flock of Mallards and Common  
Goldeneye. They were in fact Canvasbacks. I was there at 9:00 this  
morning, and they were closer to the southern end of the open water to  
the south of the ferry and were easy to pick out from the rest of the  
ducks.