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As it turned out, whales were not only more closely-related to artiodactyls than to the mesonychids.
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They actually are artiodactyls.
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Biomolecular and genetic studies repeatedly found that whales were most closely related to the group of hoofed mammals called artiodactyls, particularly hippos.
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The pig is an obvious choice due to its economic and medical importance as well as its evolutionary position in the artiodactyls.
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In the Artiodactyla the stomach is always complex, the complexity reaching a maximum in ruminating forms.
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These differ materially from the foregoing section of the Artiodactyla by the construction of their digestive organs.
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More than 200 species of mammal are distinguished by possession of hooves, known as ungulates, and are divided into two orders, even-toed and odd-toed ungulates.