A short distance up the road to the BBS tower viewpoint is a trail leading to a large fenced enclosure that was originally established as a zoo. It's worthwhile taking the time to see these oddball mammals. The best time to see them is early morning, when they gather near the fence to feed.
Some years ago the fourth king decided that a zoo was not in keeping with Bhutan's environmental and religious convictions, and it was disbanded. The animals were released into the wild, but the takins, Bhutan's national animal, were so tame that they wandered around the streets of Thimphu looking for food, and the only solution was to put them back into captivity.