Historical clue formulations

• Animal that is unable to fly with its ears, regrettably — 2024-12-03
• Animal with the longest gestation, at nearly two years — 2018-04-20
• Political symbol — 2009-11-25
• Political symbol — 2004-08-13
• Seuss's Horton, for one — 2001-07-31
• Kind of ears — 1997-06-20
• Circus heavyweight — 1995-05-22