People who live around Lugu Lake have a interesting and historic transportation tool in the water named "pig trough boat"(Zhucaochuan in Chinese). A long long time ago, when there was no lake, some evil guy did something really bad and the mortal called the flood to punish them. At that time a great Mosuo mother sacrificed herself and saved her two children by putting them into the pig trough. Therefore, to commemorate this Mosuo woman, they shape wood boats into pig troughs. Moved, huh?