Bock, Walter J. Department of Biological Sciences, Columbia University, New York, New York.
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A small order of aquatic birds that contains only a single living family, the Podicipedidae (grebes), with 20 species found throughout the world. They breed on freshwater, but some species winter along the coasts. Grebes have a number of convergent similarities with loons, but are not related to them or to the fossil hesperornithiforms. The close affinities of the grebes are still unresolved. See also: Gaviiformes; Hesperornithiformes
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