March hare

(redirected from Mad as a March hare)
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March hare

n.
A hare in breeding season, when it typically engages in aggressive behavior.

[So called because hares were traditionally said to engage in such behavior in the month of March.]

March hare

n
(Animals) a hare during its breeding season in March, noted for its wild and excitable behaviour (esp in the phrase mad as a March hare)
References in periodicals archive ?
The centuries-old expression to describe someone as 'mad as a March hare', is derived from the long-eared mammal's frenzied behaviour, so often witnessed at this time of year in the fields, moors and farms of the British countryside.
"Hare-brained'' and "mad as a March hare'' are terms that appropriately describe a species that is hair-trigger nervous and jumpy at a slight provocation.
"Everyone is entitled to be as mad as a March Hare, and I am delighted I went through my phases at 14-16 before I started my life.