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However, the situation is improving.

Anti-poaching laws are now actively enforced

so every summer, female chiru can head to the birthing grounds in relative safety.

Out on the plateau, new-born chiru are vulnerable to predators

so the mothers must try to hide and protect them.

The most recent problem faced by the chiru is the new Tibet-Qinghai railway

which cuts right through their traditional migration routes.

Running nearly 2,000 kilometres through some of the highest terrain on Earth

the railway is an astonishing technical feat.

It's too early to see its effect on the wildlife

But the engineers have made efforts to incorporate underpasses

where wildlife can cross the line in safety.

As the modern world increasingly impacts on Tibet

its traditions could be in danger of being eroded.