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In their number are thousands from the Sami, along with the Chukchi, Evenki, Eveny and Nenets in Siberia.

We were filming with indigenous Siberians of the Evenki tribe, and staying in a remote reindeer-herders camp – living in tents that were kept warm with larch stoves while it was a bone-chilling -40C outside.

We can only assume that those ancient Siberians made good use of reindeer fur in the same way that the modern Evenki do, to make clothes and boots.

I was given a pair of Evenki reindeer boots, and they are far warmer than the felt-lined expedition boots I was sent to Siberia with.