The Collaborative International Dictionary
As mad as a March Hare
March \March\ (m[aum]rch), n. [L. Martius mensis Mars'month fr. Martius belonging to Mars, the god of war: cf. F. mars. Cf. Martial.] The third month of the year, containing thirty-one days.
The stormy March is come at last,
With wind, and cloud, and changing skies.
--Bryant.
As mad as a March Hare, an old English Saying derived from
the fact that March is the rutting time of hares, when
they are excitable and violent.
--Wright.