Historical clue formulations

• Brown songbirds — 2025-10-19
• Birds that can emit a "teakettle, teakettle, teakettle" call — 2024-07-27
• Birds known for their loud, complex songs — 2024-03-31
• Birds with effervescent voices — 2020-03-04
• Images on the backs of South Carolina quarters — 2020-01-04
• Members of the genus Troglodytes — 2010-03-05
• Small songbirds — 2009-09-17
• Birds in many birdhouses — 2009-09-07
• Arizona state birds — 2009-01-04
• Small songsters — 2006-10-08
• Birdhouse dwellers — 2005-06-05
• Small songbirds — 2005-04-18
• Melodious singers — 2005-04-15
• Small songbirds — 2004-12-28
• Small songbirds — 2001-01-17
• Songbirds — 2000-02-29
• Small songbirds — 1999-11-15
• Brown songbirds — 1997-11-11
• British servicewomen — 1997-07-25
• Songbirds — 1994-03-06