Early in the Miocene, the first pronghorns entered into North America, where they then underwent a huge radiation.
The tall beast with the fork-like horns is <I>Paracosoryx loxoceros</I>, from Nebraska, and below it is <I>Subparacosoryx savaronis</I>. The small goat-like pronghorn with the broccoli-like horns is <I>Merriamoceros coronatus</I>, from California. Behind it is the dromomerycid <I>Cranioceras unicornis</I>, a member of a related group of deer/antelope-like ungulates that lived (and died) only in Miocene North America.