Historical clue formulations

• Small goose — 2006-04-15
• Small goose — 2004-12-19
• Small goose — 2004-11-21
• Black-necked goose — 2003-01-23
• Type of goose — 2001-08-07
• Kind of goose — 1999-07-16
• Migratory goose — 1999-06-03
• Mallard-sized goose — 1997-02-20