Sweetgrass (2009)

In the summer of 2003, a group of shepherds drove their sheep through the Xiongya Mountains in the northwestern state of Montana for the last time. It is nearly 300 kilometers along a green valley with many snow-covered forks, and they need to cross narrow ridges along the way. The old shepherd tried his best to keep hundreds of sheep from getting lost from hungry wolves and grizzly bears in the jungle.