I posted this poor photo (100% crop) for identification. I saw a Red-throated Loon but I didn't get a picture at the time. Then I saw this in the background of another photo that I took, so posted it thinking it was the loon. The consensus is that it is juvenile Double-crested Cormorant. I went back and got a photo of the loon the next day: http://www.pbase.com/garrettlau/image/133581626