0riginally domesticated in Southwest Asia, China, and Europe, pigs were valuable and easy to please thanks to their adjustable nature and status as omnivores. For meat, bristles, and skin, pigs were profitable in farming. Currently, in some countries, pigs help in finding truffles with their sensitive snouts. In other countries, people keep pigs as pets, raising them indoors or outdoors. Still popular for food, products include bacon, sausage, ham, head cheese, and more. Varying in color according to age and gender, chickens are feathered in browns, whites, and creams. Popular for their eggs and meat, chickens can be housed at a home, at a farm or by the thousands. For its health benefits and supply, chicken is consumed across the globe. As omnivores, chickens eat insects, seeds, and even mice and lizards. Throughout a three week long incubation, hens incubate and rotate their eggs, fertilized or not. Living up to a decade, chickens generally stay on land but have been known to fly in short bursts. As a flock, chickens abide by a pecking order. This way, the dominant birds always get first choice. Domestic goats were probably domesticated in the Middle East prior to the 11th century BC. This goat is considered one of the easiest to keep. Goats provide meat, leather and milk. Due to their excellent climbing skills, they are mainly kept in mountainous areas. Wearing thick, fleecy fur, sheep are covered wherever their farm may be. A staple of farms for centuries, sheep are domesticated for their meat, skin, fur, and genetics. As herbivores and ruminants, sheep follow a feeding pattern of grazing and chewing cud. With hundreds of species of sheep, these mammals are quite diverse in hair types and sizes. Ranging from one hundred to four hundred pounds, sheep generally grow to be as old as a decade or two. With excellent senses of hearing and smell, sheep make up for their lack of depth perception.