March hare

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March hare

a hare during its breeding season in March, noted for its wild and excitable behaviour (esp in the phrase mad as a March hare)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

March Hare

crazy rabbit who co-hosts mad tea party. [Br. Lit.: Alice’s Adventures in Wonderland]
See: Madness
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
WHY do we say someone is "as mad as a March hare?" - Agatha Jenkins, Bristol UNSURPRISINGLY the phrase comes from the strange behaviour of hares when they mate in March.
THERE are those who believe anyone so much as contemplating psychotherapy must be mad as a March hare anyway.
Mad as a March hare, Sutherland Lyall goes on a cyber Easter Egg hunt.