Historical clue formulations

• Small European finch — 2016-11-02
• European finch — 2015-03-04
• Relative of a canary — 2014-09-28
• Relative of a canary — 2010-09-26
• Small finch — 2010-03-01
• Small finch — 2006-10-28
• Small finch — 2003-06-29