Historical clue formulations

• Famously sleepy animals — 2021-09-16
• Tree huggers Down Under — 2020-02-29
• Ones carrying babies on their backs — 2017-04-29
• Aussie critters — 2017-04-09
• Billabong Zoo attractions — 2016-11-18
• Eucalyptus lovers — 2016-06-12
• Non-primates with remarkably humanlike fingerprints — 2015-09-05
• Some joeys — 2015-04-04
• Some joeys — 2015-03-28
• Supercute marsupials — 2013-12-17
• Down Under denizens — 2006-08-06
• Eucalyptus-loving "bears" — 2005-03-01
• Cuddly-looking critters — 2001-04-21
• Eucalyptus-eating animals — 2000-08-01
• Furry-eared animals — 2000-06-15
• Eucalyptus leaf eaters — 1998-12-18
• Dwellers in gum trees — 1997-09-20