There are several different types of Grebes. One that I think is particularly fascinating is the Western Grebe. This one was at Fern Ridge Lake.

'All about Birds' has this to say about the Western Grebe color pattern "Western Grebes are crisp black and white, with a sharp transition between black and white extending down the neck. The head and most of the face are black, with white below the eye. The bill is yellowish or greenish yellow and the eye is red at close range." http://www.allaboutbirds.org/guide/Western_Grebe/id)