The Patterns of Downy Grebes

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Abstract
The patterns of downy young grebes may be divided into 3 groups: those with a bare crown spot, those with one or more rufous patches of down on the top of the head, and those in which the crown is striped with black and rufous buff. The 1st group contains 8 species, which are best placed in 2 genera, Podiceps (7 species) and Aechmophorus (monotypic). The 3rd group consists of 2 species, rolland and micropterum, which are placed in the genus Rollandia. The remaining species belong in the 2nd group, which consists of the genera Podilymbus (2 species) and Tachybaptus (3 or 4 species), plus 3 species, dominicus, rufopectus, and (presumably) poliocephalus, whose relationships are not clear.

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