A BBC reporter got a startling look inside a Russian fur farm

Wild sable - a species that is related to the ferret - provide one of the most coveted and most expensive kinds of fur in the world.

Sable fur is superior to that of other animals thanks to its silky texture and range of colours from beige to black, according to an article from 2000 in The New York Times.

In July 2015, a silver-dyed sable coat from Fendi sold for €1 million (£776,226).

Wild sable are bred in fur farms across Russia to meet a growing demand for items such as bedspreads and even underwear, according to a BBC Two documentary, "This World: Inside the Billionaire's Wardrobe," which aired on April 26.

There are around 70 farms in the country that keep raise and kill wild sable and other animals for their fur. Over 80% of the world's fur is produced in fur farms, the BBC reports.

In the documentary, BBC correspondent Reggie Yates went to Russia to learn more about the country's fur industry, and to see how fur farms work.

Here's what he saw on his visit: