March Hare.
Mad as a March hare. Hares in March are very wild; it is their rutting time. (See Hare.)
Mad as a March hare. Hares in March are very wild; it is their rutting time. (See Hare.)
Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.