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Genus Podilymbus
Giant Pied-Billed Grebe - The Atitlán Grebe reached a length of about 46–50 cm. The call and appearance were similar to the Pied-billed Grebe. The plumage was mainly dark brown with white-flecked flanks. The underparts were dark grey flecked with white. The head was almost black and the neck was flecked with dark brown in the spring and white in the winter. The legs were slaty grey. The bill had a bold black vertical band in the middle. The color of the bill varied from white in the spring to brown in other seasons. The irises were brown. It had small wings and was flightless.
Pied-billed grebe - The Pied-billed Grebe is small, stocky, and short-necked. It is 31–38 cm in length, it has a wingspan of 45–62 cm and weighs 253-568 g . It is usually brown or gray in color. It has a short, blunt chicken-like bill, which in summer is encircled by a broad black band . It is the only grebe that does not show a white wing patch in flight. The sexes look alike .