Historical clue formulations

• Antarctic penguin — 2024-12-13
• One of two penguin species endemic to Antarctica — 2023-02-24
• Antarctic penguin — 2018-11-25
• Antarctic penguin — 2017-10-01
• Penguin species — 2017-06-08
• Penguin variety — 2016-05-12
• Penguin variety — 2014-07-28
• Penguin from Antarctica — 2009-12-17
• Kind of penguin — 2009-10-25
• Emperor's relative — 2009-10-16
• Penguin variety — 2006-08-06
• Variety of penguin — 2004-04-09
• Antarctica's ___ Coast — 2003-11-08
• Antarctic penguin — 2002-08-04
• Antarctica's ___ Coast — 1999-07-10
• Antarctica's ___ Coast — 1998-03-21
• Antarctica's ___ Coast — 1997-05-31