Nomadic families and their livestock have been on an annual trip to winter pastures with an elevation of 4,800 meters in Tibet Autonomous Region since mid-September.
Herdsmen need to stay where the water and grass resources are abundant. Therefore the seasonal transfer, driven by the vertical distribution of temperature, is a way to avoid overgrazing on the same pasture. Such activity aims for sustainable grazing and pasture management. It is also preserved as a local custom.