If you are like me, and have no clue what the difference between a hare and a rabbit is, check out this article: http://www.differencebetween.net/science/nature/difference-between-rabbit-and-hare/
and if you seriously want to take a crack at the "Bunnies Slaughtered" stat, here's a tutorial to get you started:
http://skyrimmw.weebly.com/skyrim-modding/adding-a-new-stat-skyrim-modding-tutorial (Good luck!)
Made for a request by puerluna.
Totally random: An interesting thing I noticed while doing this is that the editor's IDs in the CK already referred to the "rabbits" as "hares" ( for the most part ). For example, the "Rabbit race" is called "HareRace". Weird, huh?. It makes me wonder why they changed it.