Congo Artiodactyla Wild Animal Bison Bovidae Souvenir Sheet of 4 Stamps Mint NH

Congo Artiodactyla Wild Animal Bison Bovidae Souvenir Sheet of 4 Stamps Mint NH

The even-toed ungulates (Artiodactyla, from Ancient Greek ἄρτιος (ártios), meaning 'even', and δάκτυλος (dáktylos), meaning 'finger/toe') are ungulates - hoofed animals - which bear weight equally on two (an even number) of the five toes: their third and fourth toes. The other three toes are either present, absent, vestigial, or pointing posteriorly. By contrast, odd-toed ungulates bear weight on one (an odd number) of the five toes: the third toe. Another difference between the two is that even-toed ungulates digest plant cellulose in one or more stomach chambers rather than in their intestine as the odd-toed ungulates do.

The aquatic cetaceans (whales, dolphins, and porpoises) evolved from even-toed ungulates, so modern taxonomic classification sometimes combines the Artiodactyla and Cetacea into the Cetartiodactyla.

The roughly 220 land-based even-toed ungulate species include pigs, peccaries, hippopotamuses, camels, llamas, alpacas, mouse deer, deer, giraffes, antelopes, sheep, goats, and cattle. Many of these are of great dietary, economic, and cultural importance to humans.

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