The jackrabbit is actually a hare. Hares are larger than rabbits, with longer ears and legs. Fast runners, hares also tend to have above-ground nests. They bear young that are fully furred and become independent within days.
We also have cottontails, which are rabbits. More social than hares, they tend to hide rather than run from danger, and they burrow to make underground nests to protect their vulnerable babies who are born naked and blind.