| 2026-03-21 | Titular Dr. Seuss character |
| 2024-03-13 | Literary character who cries "You're glumping the pond where the Humming-Fish hummed!" |
| 2018-09-17 | Eco-conscious Dr. Seuss character |
| 2017-08-20 | Title Seuss creature |
| 2017-04-09 | See 9-Down |
| 2017-02-24 | Once-ler's opponent, in children's literature |
| 2016-12-01 | Seussian environmentalist |
| 2016-06-15 | Title Seuss character, with "the" |
| 2015-11-01 | Dr. Seuss environmentalist |
| 2013-07-18 | Hit 2012 animated film, with "The" |
| 2011-07-21 | Seuss character who "speaks for the trees" |
| 2010-07-19 | Environmentalist in a Dr. Seuss story |
| 2009-06-12 | Truffula Tree defender, with "the" |
| 2008-04-25 | Dr. Seuss book, with "The" |
| 2007-11-22 | 44-Across character, with "the" |
| 2001-05-09 | Seuss title creature |
| 1997-04-12 | Seuss creature |