March 3 is World Wildlife Day. It is a United Nations International Day to celebrate wild animals and plants on the planet and the contribution that they've made to our lives and the health of the earth. In northwest China's Xinjiang Uygur Autonomous Region, thousands of Marco Polo Argali sheep were recently spotted migrating across the Pamir Plateau. The species is second-class national protection status in China, and its gradually growing population hovers around 20,000 in Taxkorgan Tajik Autonomous County.