Sometimes, while you're walking up the approach trails in winter in Japan, you'll hear a rustling in the trees, or a sudden movement. As often as not it's a Japanese Serow, or nihon kamoshika (ニホンカモシカ).
If you're lucky you'll catch a glimpse of one, and if you're really lucky it will let you walk past at close proximity. Dont be afraid, they're very tame animals... Try not to startle it, they're also very shy. Just enjoy the priceless experience of meeting a large animal in its own environment.
For more information on this excellent creature, read the following Wikipedia entry: