Giraffes are one of only two living genera of the Giraffidae family in the order of Artiodactyla, the other being okapi. The lineage of this species was once much more diverse, with more than 10 fossil genera described. Their closest known relative is probably the extinct giraffe. They, along with the family Antilocapridae (the only surviving species is the pronghorn), have been classified in the Giraffoidea superfamily. These animals may have evolved from the extinct family Palaeomerycidae, possibly also ancestors of deer.