English: Onager (Equus hemionus), a Kazakhstan stamp, 20, 1993
Русский: Кулан (Equus hemionus), почтовая марка Казахстана, 20, 1993
Українська: Кулан (Equus hemionus), поштова марка Казахстану, 20, 1993
Date 13 August 2006 (original upload date)
Source: https://commons.wikimedia.org/wiki/File:Equus_hemionus_onager_-_stamp.jpg

The Persian onager (Equus hemionus onager), also called the Persian wild ass or Persian zebra, is a subspecies of onager (Asiatic wild ass) native to Iran. The Persian onager is also simply named gur, meaning "swift" in the Persian language, in which the word gur has preserved as the second syllable for ono, which meant "donkey". Hence, onager.