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It's the beginning of winter, high up on the Tibetan plateau

The temperature will soon drop to minus 40 Celsius

Out here,life is reduced to a single imperative - survival

For the argali, the world's largest sheep

it means searching for a few tufts of grass

Descending from the hilltops to lower altitudes the argali band together for safety

Hopefully, down here,they'll be able to find enough food to last them through the rest of the winter

Although this winter landscape looks barren and forbidding

Tibet's remote grasslands support a surprising variety of creatures

Though at this time of year, they can be hard to track down