Historical clue formulations

• Big, bushy-tailed squirrel — 2021-02-10
• Animal in the squirrel family — 2019-06-19
• Rocky Mountains rodent — 2016-06-01
• Woodchuck, e.g. — 2014-04-18
• Burrower with a bushy tail — 2010-02-20
• Rockies rodent — 2008-09-24
• 37-Down, e.g. — 1995-02-02
• Bushy-tailed animal — 1995-01-03