Historical clue formulations

• Asiatic animal with a mane — 2018-04-26
• Wild equine — 2018-04-04
• Asian wild ass — 2015-04-05
• Asian wild ass — 2014-09-21
• Cousin of a donkey — 2014-08-29
• Asian wild ass — 2013-07-07
• Wild equine of 79-Across — 2012-09-30
• Wild ass — 2009-10-14
• Equus hemionus — 2005-10-08
• Relative of the zebra — 1996-05-19
• Equus hemionus — 1994-01-23