It is reported that on the occasion of the building of Qinghai-Tibet railway, a lot of big and beautiful billboards telling people to protect animals have been erected along this great railway, which become another scenery in the snowfield.

On these billboards , a lot of words like "Protecting ecosystem and love every inch of greenland""Wild animals - friends of the humanbeing" and "We have only one green earth" are written on these billboards. A lot of visitors stop to take photograph of these billboards.