Historical clue formulations

• Surprisingly dangerous "river horse" — 2026-06-30
• Campus opening? — 2025-11-01
• Land animal closely related to whales — 2025-05-02
• "Hungry hungry" animal in a popular game — 2023-06-21
• Mudhole wallower — 2023-05-07
• Animal that dances ballet in "Fantasia" — 2022-01-03
• Big body in Africa — 2020-06-17
• Source of illegal ivory, informally — 2019-12-06
• Whale's closest living land relative — 2019-10-24
• Gloria, in the animated "Madagascar" films — 2019-07-14
• Ballet dancer in "Fantasia" — 2018-10-09
• One wallowing in a zoo pond — 2018-06-12
• Zoo resident that needs a big tank — 2017-06-27
• Land animal whose closest living relatives include whales — 2016-04-19
• Cetacean's closest relative — 2016-02-12
• Zoo heavyweight, informally — 2015-07-27
• Nile wader — 2015-02-26
• Zoo heavyweight, for short — 2013-01-28
• One form of the Egyptian god Set — 2012-06-29
• Animal with a huge yawn — 2011-08-14
• Critter with foot-long teeth — 2011-07-17
• Gloria in "Madagascar," e.g. — 2011-07-16
• Zoo heavyweight — 2010-09-19
• One with a thick skin — 2007-05-20
• African wader — 2005-01-11
• Mudhole lover — 2004-08-29
• Zoo heavyweight — 2003-07-22
• Zoo favorite — 2002-09-29
• Hulking herbivore — 2002-06-25
• Congo basin denizen — 2001-08-18
• River resident — 2000-08-04
• A big body in Africa — 2000-08-03
• Swimmer in the Congo — 1997-06-10
• "Fantasia" dancer — 1994-12-04
• "Fantasia" ballerina — 1994-01-19