The second suborder of odd-toed ungulates includes some bizarre animals, which present paleontologists with many enigmas. There were 2 families. The eomoropids were the first to evolve and generally resembled other prima-tive odd-toed ungulates. They lived in eastern Asia and North America during the Eocene and Early Oligocene, between 50 and 35 million years ago. The second and most important family of ancylopods are the chalicotheres. They probably evolved in Eurasia during the Eocene and spread into Africa and North America during the Miocene. They survived until about 2 million years ago in eastern Asia and central Africa with little evolutionary change.
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