Historical clue formulations

• Small songbirds — 2024-09-21
• "White-fronted" or "chestnut-bellied" birds — 2020-10-10
• Small songbirds — 2015-06-06
• Small songbirds — 2015-01-06
• Small songbirds — 2013-09-23
• Small songbirds — 2012-11-18
• Small songbirds — 2009-03-11
• Chickadees' kin — 2008-04-20
• Little birds — 2004-06-25
• Small songbirds — 1999-12-05
• Small songbirds — 1997-01-12
• Short-billed songbirds — 1995-03-25