The penguins: flightless, aquatic birds with wings modified into rigid flippers used for swimming rather than flight, a thick layer of insulating fat, and dense, waterproof feathers, confined almost entirely to the Southern Hemisphere.
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Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Sphenisciformes
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