Historical clue formulations

• Spiral-horned African antelope — 2020-12-29
• Spiral-horned antelope — 2014-06-01
• Spiral-horned antelope — 2013-03-23
• Antelope with lyre-shaped horns — 2012-08-03
• White-striped antelope — 2006-04-14
• African antelope — 2003-02-02
• African antelope — 1997-11-21
• Striped antelope — 1995-09-09