Historical clue formulations

• Bird-related prefix — 2025-04-24
• Prefix with fauna — 2025-04-03
• Bird-related prefix — 2024-11-21
• Bird: Prefix — 2024-06-26
• Bird: Prefix — 2023-01-06
• Flying start? — 2022-04-30
• Bird: Prefix — 2021-09-22
• Prefix with fauna — 2019-10-23
• Bird: Prefix — 2019-10-07
• Bird: Prefix — 2015-10-29
• Bird: Prefix — 2014-07-20
• Bird: Prefix — 2014-03-01
• Prefix with culture — 2014-02-01
• Bird: Prefix — 2013-01-15
• Bird: Prefix — 2012-11-06
• Flying start? — 2012-07-21
• Prefix with culture — 2011-10-16
• Opening for birds? — 2011-09-09
• Prefix with fauna — 2009-12-20
• Prefix with culture — 2008-03-08
• Bird: Prefix — 2007-12-28
• Bird: Prefix — 2007-07-22
• Bird: Prefix — 2007-07-10
• Flying start? — 2006-09-24
• Bird: Prefix — 2005-10-23
• Bird: Prefix — 2005-07-10
• Prefix with fauna — 2005-04-30
• Bird: Prefix — 2004-12-12
• Prefix with culture — 2002-06-29
• Prefix with fauna — 2001-07-06
• Prefix with culture — 2000-03-10
• Bird: Prefix — 1997-10-31
• Bird: Prefix — 1995-12-03
• Bird: Prefix — 1995-01-12