Chicken is the meat derived from chicken. It is the most common type of poultry in the world, and is frequently prepared as food in a large number of ways. Chickens raised specifically for meat are called broilers. The broilers are typically butchered at a young age, for example, most are butchered as early as 8 weeks for fryers and 12 weeks for roasting birds. Typically, the muscle tissue (breast, legs, thigh, etc), livers, hearts, and gizzard are processed for food. Chicken feet are commonly eaten, especially in French and Chinese cuisine. Chicken wings refers to a serving of the wing sections of a chicken. Exotic parts like pygostyle (chicken's buttocks) and testicles are commonly eaten in East Asia and some part of South east asia. Whole mature chickens are marketed in the United States as fryers, broilers, and roasters.