Historical clue formulations

• Birdbrain — 2026-05-12
• Bygone bird — 2026-03-22
• Bird that scientists are trying to bring back from extinction — 2026-02-02
• Imbecile — 2025-09-14
• Bird symbolizing obsolescence — 2024-10-23
• Airhead — 2024-10-02
• Bird in "Alice in Wonderland" — 2024-09-25
• Wonderland bird — 2024-08-04
• Extinct bird that wasn't really "dumb" — 2022-10-24
• Chowderhead — 2022-03-29
• Bird that had no natural predators until humans arrived — 2021-08-18
• Bird with a reduplicative name — 2021-07-21
• Knucklehead — 2021-04-25
• Dumb bunny — 2021-04-07
• Bird in "Alice's Adventures in Wonderland" — 2021-03-03
• "Dumb" bird — 2020-11-23
• Dummy — 2020-01-12
• Bird akin to the nene? — 2019-02-24
• Numbskull — 2018-05-22
• Nincompoop — 2018-04-06
• Epitome of stupidity — 2018-02-27
• "Dumb" bird — 2018-01-08
• Bubblehead — 2017-12-02
• Slow-witted sort — 2017-05-10
• Blockhead — 2017-05-07
• Dummkopf — 2017-05-05
• Dim bulb — 2017-03-29
• Numbskull — 2017-03-12
• Dummy — 2016-07-24
• Dummy — 2015-11-08
• Dullard — 2015-08-09
• Nincompoop — 2015-02-28
• Birdbrain — 2014-12-28
• Ninny — 2014-12-27
• Dummy — 2014-10-17
• Airhead — 2013-11-26
• Dummy — 2013-08-25
• Awarder of a thimble to Alice, in "Alice's Adventures in Wonderland" — 2013-04-05
• "Alice in Wonderland" character — 2012-08-05
• Dimwit — 2012-02-24
• Dumb ox — 2011-08-22
• Nitwit — 2011-04-13
• Dummy — 2011-02-25
• Part of Mauritius's coat of arms — 2010-10-23
• Animal on Mauritius's coat of arms — 2010-05-21
• Bye-bye birdie? — 2009-04-05
• Thickhead — 2008-09-17
• Numbskull — 2008-04-13
• Long-gone bird — 2008-03-04
• Dumbbell — 2007-10-01