There are several kinds of herbivorous herd animals to be found in the Old World, from domestic cattle to wild bison. Although they vary in size, strength, and other characteristics, they have many attributes in common and are thus described in general terms here. Two specific examples (Bison and Elk) are covered in more detail. Domestic animals (sheep, goats, etc.) are usually accustomed to people and thus very docile. However, many farmers will have dogs or other means of protecting their livelihood from rustlers.