An ewe gives birth to a lamb on the Sensen Spring Pasture in Qiaga Township of Damxung County, southwest China's Tibet Autonomous Region, Feb. 26, 2016. Spring is a season for lamb births. As spring comes, herdsmen living on the 5,000-meter-high Sensen Spring Pasture in Qiaga Township of Damxung County are busy with delivering Tibetan lambs. Tibetan sheep, which mainly live above the elevation of 4,500 meters, are hersmen's essential means of livelihood as well as important means of production. Most Tibetan sheep give birth annually to a single lamb, which usually weighs 2.7-5.0 kilograms at birth. (Xinhua/Chogo)