Why do Tujia people choose to live in the suspended house？

A、Firstly, it can keep people away from deadly wild animals in the old days.;
B、Secondly, people can stay away from the humidity close to the ground and prevent humidity related diseases such as Rheumatism.;
C、Thirdly, there is better lighting upstairs, so people can work on delicate handcrafts or simply enjoy the brightness.;
D、Last but not least， the terrian decides the style of the house.