Whales, dolphins and porpoises: fully aquatic mammals descended from land-dwelling, hoofed ancestors, with forelimbs modified into flippers, no hind limbs, and a horizontally flattened tail fluke used for propulsion. Cetacea includes the blue whale, the largest animal known to have ever lived.
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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 Cetacea
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