Historical clue formulations

• See 28-Across — 2023-03-15
• Beatrix Potter's Mrs. Tiggy-winkle, for one — 2019-06-23
• Mr. Pricklepants in "Toy Story 3," e.g. — 2012-12-08
• Spinose mammal — 1995-12-28
• Erinaceus europaeus — 1995-11-18