On the off chance that your question might have a hint of actual inquiry; Since the domestication of sheep (perhaps 10,000 years ago) they have been continually bred to improve certain characteristics... including light colored wool which is much easier to dye in making cloth. The Rambouillete, a predominant breed here in the western U.S. was bred for such purposes. Funnily, many years ago, a black sheep would be produced by a ewe... which would then be used as a "counter" for a flock. One black sheep equaled 800 head of white ones and made them easier to account for.
Most highly selective breeding has also caused them not have muscle control of their tails. Since they can't move the tail out of the way for bowel movements and soon becomes clogged and maggot ridden, the tails are removed a few weeks after the lamb is born... along with the removal of testicles which are highly prized for a "lamb fry" feast here in the U.S. At the very least, the "townies" volunteer to come out and help in the functions just to be present when the rancher yells "Dinner's on the table!" The ranchers (or at least their wives) tend to vie with each other over the amount and quality of the feast...
By the way, you probably don't want to hear a description of the "old fashioned" way of testicle removal still favored by the largely Basque heritage sheep ranchers here...