the males produce noises at the start of a rainy season to attract a female. That is usually when their mating season begins. it can also be a way to warn other mates about their territory. it all...
Because of how the earth faces the sun
they hibernate
Snow shoe (Arctic) hares moult out their summer (agouti brown) coats for a coat of white for the winter.
Temperature changes occur both horizontally and vertically with depth, making the comfort zone a constantly moving target.