sheep's wool vs. polyfil

Several months ago, while having some mods done to an older pair of speakers' x-overs, I asked some questions on this forum about insulation/damping. A few people posted responses stating long-haired sheep's wool is a great alternative to traditional polyfil and actually superior in performance. At first, I thought they were joking at this newbie's expense (and they very well may be...still). If they were indeed sincere could somebody please weigh in on this topic and explain the benefits to me? It may be worth the afternoon to experiment with this alternative medium. Also, where would I be able to buy some of this wool (I haven't had much luck w/online searches). If I've been played the fool, please excuse my idiocy. Thank you and BAAAA!