Chicken is sold both as whole birds and broken down into pieces.
In the United Kingdom, juvenile chickens of less than 28 days of age at slaughter are marketed as poussin. Mature chicken is sold as small, medium or large.
In the United States, whole mature chickens are marketed as fryers, broilers, and roasters. Fryers are the smallest size (2.5-4 lbs dressed for sale), and the most common, as chicken reach this size quickly (about 7 weeks). Broilers are larger than fryers. Roasters, or roasting hens, are the largest chickens commonly sold (3–5 months and 6-8 lbs) and are typically more expensive. Even larger and older chickens are called stewing chickens but these are no longer usually found commercially. The names reflect the most appropriate cooking method for the surface area to volume ratio. As the size increases, the volume (which determines how much heat must enter the bird for it to be cooked) increases faster than the surface area (which determines how fast heat can enter the bird). For a fast method of cooking, such as frying, a small bird is appropriate: frying a large piece of chicken results in the inside being undercooked when the outside is ready.
Chicken is also sold broken down into pieces. Such pieces usually come from smaller birds that would qualify as fryers if sold whole. Pieces may include quarters, or fourths of the chicken. A chicken is typically cut into two leg quarters and two breast quarters. Each quarter contains two of the commonly available pieces of chicken. A leg quarter contains the thigh, drumstick and a portion of the back; a leg has the back portion removed. A breast quarter contains the breast, wing and portion of the back; a breast has the back portion and wing removed. Pieces may be sold in packages of all of the same pieces, or in combination packages. Whole chicken cut up refers to either the entire bird cut into 8 individual pieces. (8-piece cut); or sometimes without the back. A 9-piece cut (usually for fast food restaurants) has the tip of the breast cut off before splitting. Pick of the chicken, or similar titles, refers to a package with only some of the chicken pieces, typically the breasts, thighs, and legs without wings or back. Thighs and breasts are sold boneless and/or skinless. Chicken livers and/or gizzards are commonly available packaged separately. Other parts of the chicken, such as the neck, feet, combs, etc. are not widely available except in countries where they are in demand, or in cities that cater to ethnic groups who favor these parts.
Worldwide, there are many fast food restaurant chains that sell exclusively or primarily poultry products including KFC (global), Red Rooster (Australia), Hector Chicken (Belgium) and CFC (Indonesia). Most of the products on the menus in such eateries are fried or breaded and are served with french fries.
