Historical clue formulations

• Birds on Canadian dollars — 2022-06-05
• Birds on Minnesota state quarters — 2020-01-26
• Water birds with haunting cries — 2019-09-30
• Birds on Canadian dollar coins — 2019-02-12
• Whack jobs — 2017-06-21
• Nut jobs — 2014-09-14
• Fruitcakes — 2011-11-19
• "Crazy" birds — 2009-10-19
• Nuts — 2005-04-23
• Fruitcakes — 2002-02-02
• "On Golden Pond" birds — 1996-02-26
• Crazies — 1995-07-16
• Grebes' cousins — 1995-03-12
• Lake life — 1994-03-19