Imbolc Hare Moon
According to the Oxford Companion to the Year (OCY), the notion of mad as a March hare comes from a fundamental misunderstanding of the mating habits of the Lepus. It was folk wisdom that the hare got up to all kinds of peculiar behavior in March because this was its month to mate. The behavior including standing on their hind legs and boxing with each other. Apparently though the bunnies do in fact stay at it for several months of the year.