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Yak butter/ "Dri Butter" འབྲི་མར། is butter made from the milk of the domesticated female yak known as Dri འབྲི། (Bos grunniens). It is a staple food

the French by Peter Fleming, pp. 102-3. (1955). E. P. Dutton & Co. Inc. New York. "Sherpa Butter Tea".  "Yak Butter Tea".  Forbes, Andrew ; Henley