Yak

Yaks were a type of bovine pack mammal native to central Asia.

Tibetans drank hot yak butter tea to fortify themselves against the cold of their native land. (COMIC: Yonder... The Yeti ^[+]Loading...["Yonder... The Yeti (comic story)"])

The Fifth Doctor once bribed some sherpas with jelly babies to transport his TARDIS by yak. (AUDIO: The Roof of the World ^[+]Loading...["The Roof of the World (audio story)"])