 You never hear of sheep migrating along in great flocks, fending for themselves, or surviving without external protection. They panic at the slightest sound. Their wool, which becomes thick, matted, and tangled, if not regularly sheared, can weigh them down or trap them in thorns. They have no sense of direction, little native intelligence, no way to defend themselves. They can't track down their own food that can get lost even in their own pasture."