Lesley McClurg narrates this video that focuses on how silkworms that humans have bred in captivity for thousands of years have evolved differently from wild silk moths.

The silkworms have been bred by humans because covet the silk they produce. But the majority of them are k**led when manufacturers boil, steam, or dry them out in the sun. The silk industry today is valued at more than $10 billion.

Check out the video above to get the whole story.

If you want to see more videos like this, follow the Deep Look YouTube page.