Historical clue formulations

• Relative of a guinea pig — 2019-08-04
• Guinea pig relative — 2017-07-23
• Rabbitlike rodent — 2004-09-23
• Rodent that makes an affectionate pet — 2003-04-04
• Rabbitlike rodent — 2001-01-25
• Cousin of a guinea pig — 2000-01-19
• Rodent that menaces sugar cane — 1999-08-01