Historical clue formulations

• Acts like an ass? — 2019-05-03
• Is an ass? — 2015-04-12
• Donkey sounds — 2013-06-18
• Hee-haws — 2013-02-05
• Harsh calls — 2006-06-10
• Sounds like a donkey — 2005-04-25
• Barnyard sounds — 2002-08-25
• Mimics a 41-Down — 2002-01-06
• Donkeys' cries — 2000-05-31
• Not-so-joyful noises — 1999-12-31