Mad as a March hare

Two mad male March hares boxing on Elmley marshes

March is the month in which hares breed, a time of the year when they indulge in their elaborate and energetic courtship displays. Leaping and running about wildly, the hares appear to be behaving out of character, giving rise to the notion that they are in some way mad. By association, any person who behaves abnormally and some-what recklessly might be termed as mad as a March hare too.