Why?Because people don't invade their habitat anymore, thanks to modernity.
Now, says Norbu, people don't need to go up to the mountain to collect wood or graze their animals. They cook on gas rings, and farming patterns have changed. The villagers spend more of their time growing cash crops such as potatoes and oil seeds.
Where sundown used to be the end of the day, now, with electricity, villagers weave late into the evening - making rugs and shawls to sell at craft markets as far away as the capital Thimpu.