Respect of life, gratitude to nature, and harmonious coexistence have all become a way of living in Sanjiangyuan National Park, where I 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 ro protect the source of three rivers. Come witness the lasting bond of love between humans and animals.