Northwest China's Qinghai Province is a vital water source in the Qinghai-Xizang Plateau. It holds the headwaters of the Yellow, Yangtze and Lancang rivers. It's an important ecological security barrier, a climate-sensitive initiation zone in the northern hemisphere, and a global ecosystem regulation stabilizer. It is also a base for alpine wildlife, with a special ecological status. Respect for life, gratitude to nature and harmonious coexistence have all become a way of living in Sanjiangyuan National Park, where CGTN's Tian Wei met a group of eco-guardians at an altitude of 4,000 meters. They treat animals as their beloved family members and friends. Let's take a look at the work and daily life of Sanjiangyuan rangers, who work to protect the source of the three rivers. Come witness the lasting bond between humans and animals.