whale 10 | whale 52 hertz Whale Whales are a widely distributed and diverse group of fully marine placental marine mammals. They are really an informal grouping within the infraorder Cetacea, usually excluding dolphins and porpoises. Whales, dolphins and porpoises belong to the order Cetartiodactyla with even-toed ungulates and their closest living relatives are the hippopotamuses, having diverged about 40 , 000, 000 years ago. The two parvorders of whales, baleen whales (Mysticeti) and toothed whales (Odontoceti), are thought to have split separately around 34 million years ago. The whales comprise 8-10 extant families: Balaenopteridae (the rorquals), Balaenidae (right whales), Cetotheriidae (the pygmy correct whale), Eschrichtiidae (the greyish whale), Monodontidae (belugas and narwhals), Physeteridae (the orgasm whale), Kogiidae (the little and pygmy sperm whale), and Ziphiidae (the beaked whales). Whales are beings of the op...
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