mad as a March hare

 

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mad as a March hare

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Possibly from the boisterous behaviour of hares in their breeding season.

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mad as a March hare (not comparable)

1. (simile, informal) Crazy, demented.

   Synonyms: mad as a hatter; see also Thesaurus:insane

   • 1577, Richard Stanyhurst [i.e., Richard Stanihurst], “[The Historie of Irelande […].] A Treatise Contayning a Playne and Perfect Description of Irelande, […].”, in Raphaell Holinshed, The Firste Volume of the Chronicles of England, Scotlande, and Irelande […], volume I, London: […] [Henry Bynneman] for Iohn Hunne, →OCLC, folio 14, recto, column 1:

     [S]he was with childe in hir huſbande his abſence, or that hir louer vſed hir fondly in open preſence, as the preſumption was not onely vehement, but alſo the fact too too apparent. Hir vnfortunat huſband had not ſooner notice gyuen him vpon his returne of theſe ſorowfull newes, then his fingers began to nibble, hys teeth to grinne, hys eyes to trickle, his eares to dindle, his heade to dezell, in ſomuch as his heart being ſkeared wyth ialouſie, & his wits enſtalde through Phrenſie, he became as madde, as a marche hare.