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I want to know why elephants and other animals bearing resemblance to it are called pachyderms?

The word pachyderm is defined as: any of the thick-skinned, nonruminant ungulates, as the elephant, hippopotamus, and rhinoceros. In systematics, the order pachydermata is no longer in use. Those animals are now placed in the orders Perissodactyla (horsse types, tapirs & rhinos, odd-toed ungulates), Hyracoidea (Hyrax), Proboscidea (elephants, mammoth, etc), Suina (pig, hippo), and Artiodactyla (even-toed ungulates).Grace Fields

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