Pliny’s Natural History treats the weasel among small predators entering Roman natural-history and drug speech. A named weasel in that encyclopedia, not stoat or ferret as separate shelf ids and not a household-omen dump alone.
Ovid’s Metamorphoses Book 9 turns Galanthis into a weasel after she tricks Lucina at Hercules’ birth. A named weasel metamorphosis in that poem, not a generic mustelid dump and not a household-pest flatten alone.