What birds lay eggs on rocks?

Many speecies but particularly sea-birds such as species of auk.

The Killdeer (Charadrius vociferus) lays it eggs directly in the rocks, i have not found any other kind of nest material around them either. they sit on the rock all day most days, but did see the eggs one day when it was rainy. just hiding there in the rocks, very hard to find and i knew where to look.