Historical clue formulations

• Animal whose pattern allows it to camouflage into grassland — 2024-08-10
• Final image in a preschooler's book, maybe — 2023-12-31
• Inspiration for some fashion lines? — 2022-12-16
• "How fast does a ___ have to run before it looks gray?": Demetri Martin — 2022-10-07
• Two-tone beast that sleeps standing up — 2019-06-26
• Referee, in slang — 2018-07-13
• Alphabetically last animal in a zoo, usually — 2016-08-22
• N.F.L. ref, slangily — 2015-09-02
• Parent of a zorse or a zonkey — 2015-07-29
• Image on the last page of an alphabet book — 2015-03-03
• "I finally got around to reading the dictionary. Turns out the ___ did it": Steven Wright — 2012-12-01
• Striped equine — 2012-05-21
• Whistle-blower, in slang — 2011-04-24
• Last picture in an alphabet book — 2010-12-23
• Beast on Botswana's coat of arms — 2010-08-28
• Equus quagga — 2010-06-29
• Ref — 2009-11-14
• Zoo equine — 2005-08-22
• Gridiron ref — 2000-12-07
• Kind of crossing — 1997-09-26
• Striped critter — 1997-05-20