Tibetan herders make their living by raising yaks for grazing. Cow dung is the only fuel for the herders in the snowy plateau. At night, the yaks are herded into the sheep and cattle pens, and in the morning, the herdsmen have to clean up the cattle pens and pick up the yak dung from the night and dry it out in the sun. This is a picture of a herdsman's labor to pick up cow dung in the early morning!