Historical clue formulations

• Counterparts of troughs — 2026-09-06
• Tops of waves — 2025-10-26
• Wave peaks — 2025-06-17
• Peaks of waves — 2023-03-27
• Families and waves might have them — 2023-02-03
• Parts of waves — 2019-12-08
• Family symbols — 2016-04-17
• Tops of waves — 2015-01-19
• Colorful parts of many birds — 2014-09-15
• Peaks — 2012-10-03
• Tops — 2007-12-27
• Blue jay toppers — 2007-03-05
• Cardinal features — 2005-08-26
• Family matters? — 2005-03-03
• Families may have them — 2004-03-07
• Reaches a peak — 2001-02-28
• Tops — 1999-02-20
• Helmet plumes — 1998-03-22
• High points — 1995-02-14
• Summits — 1993-12-26