25% of the world's sheep are fat-tailed.
There are in Arabia two kinds of sheep worthy of admiration, the like of which are nowhere else to be seen. One kind has long tails no less than four and a half feet long which, if they were allowed to trail along the ground, would be bruised and develop sores. As it is, the shepherds have enough skill in carpentry to make little carts for their sheep's tail. The carts are placed under the tails, each sheep having one to himself. HERODOTUS
There are in Arabia two kinds of sheep worthy of admiration, the like of which are nowhere else to be seen. One kind has long tails no less than four and a half feet long which, if they were allowed to trail along the ground, would be bruised and develop sores. As it is, the shepherds have enough skill in carpentry to make little carts for their sheep's tail. The carts are placed under the tails, each sheep having one to himself. HERODOTUS