All about sheep
One of the downsides to being a human is our lack of a warm, furry outercoat. Historically, people would have to wear the furs and skins of other animals in order to stay warm during cold winters. One of the warmest things to wear was wool, the coarse, hair-like covering of sheep.
Sheep were domesticated in pastures about 12,000 years ago, and as they were tamed, their appearance changed.