Actually there are three creatures referred to as the yeti. It always walks on two legs. It leaves behind clawed footprints.
Locals say it raids livestock holdings.
It is very likely to be some kind of bear. The Teh-lma is about three to four feet tall with a pointed head and reddish fur. They appear to subsist on frogs. See the Bigfoot section of my cryptozoology links page for more sites offering information about the Yeti and similar creatures. This set of fifteen triangular stamps presents traditional Bhutanese images of the Yeti.