Geologic period: Oligocene
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Archaeotherium (Greek, "Ancient Beast") is an extinct genus of forest-dwelling entelodont artiodactyl found in North Dakota. It was a relative of pigs, but is not considered a true pig.
In life, Archaeotherium would have resembled a fanged warthog with an unusually large head. As with other entelodonts, it is regarded as an omnivorous scavenger. Their strong neck muscles suggest that these animals spent most of their time rooting and grubbing in the ground, sniffing out tubers and fungi, not unlike modern-day wild pigs. They probably died out when their forests dried out and the great grasslands began to spread.
Their fossils were first discovered by Joseph Leidy in 1850.