Historical clue formulations

• Crow relatives — 2013-08-02
• Crows' kin — 2011-12-10
• Glossy black birds — 2010-04-25
• Crow cousins — 2009-08-11
• Crow cousins — 2008-12-17
• Black birds — 2008-01-11
• Chattering birds — 1997-09-17