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The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the of some animals, including ( and other , , , ), , some , some , and some . This specialized constructed of thick muscular walls is used for grinding up food, often aided by particles of stone or grit. In certain and , the gizzard features plates or teeth.


Etymology
The word gizzard comes from the giser, which derives from a similar word in gésier, which itself evolved from the gigeria, meaning .


Structure

In birds
swallow food and store it in their crop if necessary. Then the food passes into their glandular stomach, also called the , which is also sometimes referred to as the true stomach. This is the secretory part of the stomach. Then the food passes into the gizzard (also known as the muscular stomach or ventriculus). The gizzard can grind the food with and pass it back to the true stomach, and vice versa. In layman's terms, the gizzard 'chews' the food for the bird because it does not have teeth to chew food the way humans and other mammals do.

By comparison, although in birds the stomach occurs in the digestive tract prior to the gizzard, in grasshoppers the gizzard occurs prior to the stomach, while in earthworms there is only a gizzard, and no stomach.


Koilin lining
In order to protect the muscles of the gizzard, the organ has a multi-layered membrane - or gastric cuticle - made of koilin, a carbohydrate-protein complex (and not keratin as once believed) to protect the muscles.
(1984). 9780702008726, Baillière Tindall. .
The thickness of this membrane varies with the types of food the animal eats, with diets heavier in grains, seeds, and insects creating thicker membranes than those consisting of fruits, worms, meat, and other softer edibles. In some animals the membrane is slowly worn and replaced over time, while others will discard the worn lining in its entirety periodically.

The lining is critical to the proper functioning of the gizzard, but in some animals it can play an additional role as well. The male , for example, will fill its gizzard with fruit and then slough off the entire membrane to present it like a 'bag of fruit' to its mate during the nesting season.


Gizzard stones
Some animals that lack teeth will swallow stones or grit to aid in fragmenting hard foods. All birds have gizzards, but not all will swallow stones or grit. Those that do employ the following method of chewing:

These stones are called gizzard stones or and usually become round and smooth from the polishing action in the animal's stomach. When too smooth to do their required work, they may be excreted or regurgitated.


Animals with gizzards

Mammals
lack teeth and grind their food in a gizzard-like structure alongside pebbles.
(2011). 9780763762995, Jones & Bartlett Learning. .


Birds and other archosaurs
All birds have gizzards. The gizzards of , turkeys, , and are most notable in cuisine (see below). such as and also have gizzards.

that are believed to have had gizzards based on the discovery of gizzard stones recovered near fossils include:

The belief that had a gizzard has been discredited on the grounds that the fossil remains this claim was based on were another species and the stones merely from a stream.

(2025). 9780253348173, Indiana University Press.

At least some pterosaurs seemingly had gizzards. The most notable cases are (inferred via gastroliths) and (directly preserved).

(2025). 9780691150611, Princeton University Press.

Carnivorous birds such as birds of prey as well as kiwis have membranuous gizzards as opposed to the sub-compressed gizzards of most birds.

Conversely, it is thought that some extinct birds like did not have gizzards.


Fish
The mullet () found in waters worldwide, and the gizzard or mud , found in freshwater lakes and streams from New York to Mexico, have gizzards. The ( Salmo stomachius), a richly colored species of found in , a lake in the north of Ireland, has a gizzard which is used to aid the digestion of water snails, the main component of its diet.


Crustaceans
Some crustaceans have a gizzard although this is usually referred to as a gastric mill.


Earthworms
also have gizzards.
(1996). 9780412561603, Chapman & Hall.


In cuisine
gizzards are a popular food throughout the world.

Grilled gizzards are sold as in and throughout . They are considered .

consist of the heart, liver and gizzard of a bird, and are often eaten themselves or used as the basis for a soup or stock.

Gizzard and mashed potato is a popular dish in many European countries.


Europe
Stewed gizzards are eaten as a snack in , with a tomato based sauce.

In , they are cooked on the , and eaten while they are crispy on the outside.

In , it is made with as zúza pörkölt.

In , especially the region, duck gizzards are eaten in the traditional Périgordian salad, along with , and .

In , gizzards are often used mixed with other .

In countries, gizzards are the basis of many soups, such as .

In , gizzards are referred to as pupik'lech (also pipiklach, in its less normative form), literally meaning . The gizzards of species of birds have a green or yellowish membrane lining the inside, which must be peeled off before cooking, as it lends a very bitter taste to the food. In traditional Eastern European , the gizzards, necks and feet of chickens were often cooked together, although not the , which per kosher law must be . Kosher butchers often sell roasting chickens with the gizzard, neck and feet butchered and left in the cavity to be used for making .


Asia
In , gizzard and liver ( ati ampela) are considered part of a complete fried poultry dish.

In , gizzard is called zuri or sunagimo; usually it is cooked in (Japanese style skewered barbecue). In (southern Japan), gizzard is fried into .

In , chicken gizzard, called , is stir-fried and eaten as anju or . In some places, it is prepared raw and eaten mixed with garlic and onion.

In , gizzards are often slow-cooked and served hot or cold in slices, with green onions and soy sauce. Skewered deep-fried gizzards without batter are also popular and served on the menu of many fried chicken stores.

In , gizzard is a common snack, eaten alongside other duck parts such as feet, neck, heart, tongue, or head. (2015), Chinese words and characters for "gizzard", Language Log, 7 January 2015. Areas famous for their gizzard are and provinces. city in Hubei is famous for its brand of spicy gizzard, called jiujiuya (Simplified Chinese: 久久鸭). In Northern China, one can find barbecued duck gizzard.

The word sangdana is commonly used to refer to chicken gizzards in Northern . The word is derived from (sang = stone and dana = grain). Another name is pathri. It may be served cooked in a curry, while barbecued skewered gizzards are also popular. In , vattum-karulum (literally translates to gizzard-liver curry) is a popular dish.

In , some restaurants mix chicken gizzards in their kebabs to increase the meat content. Gizzards are usually cooked at the same time along with chicken, packets of gizzards are also sold separately.

In , gizzard is called jaatey or pangra. It is eaten most often with drinks.

In the , gizzard is called "Balun Balunan". It is usually cooked as a street food in a skewered barbecue style, though some households treat it like an entree. The most common style is "Adobo".


Africa
In and , it is eaten boiled, fried or grilled. Grilled, skewered gizzards, with spices and optional green peppers and onions, are popular.

In , gizzard is either grilled or fried and served with stew and fried plantain, known as . Skewered gizzards are also popular.

In , , and , the gizzard of a cooked chicken is traditionally set aside for the oldest or most respected male at the table.

In , gizzard and other giblets are now commonly sold separately in the frozen section of supermarkets.


Americas
turkey gizzards are a traditional food in some parts of the Midwestern United States. In , gizzard is battered, deep fried and served with and sauce. The Chamber of Commerce in Potterville, Michigan has held a Gizzard Fest each June since 2000; a gizzard-eating contest is among the weekend's events. In the Southern United States, the gizzard is typically served fried, sometimes eaten with hot sauce or honey mustard, or added to boil along with crawfish , and it is also used in traditional New Orleans .

In , they are eaten with rice or with chicken soup. They are also served grilled and prepared scrambled with eggs, onions, garlic and salsa; and served with beans and tortillas for breakfast and other meals.

In Trinidad and Tobago, gizzards are curried and served with rice or bread; it can also be stewed.


Generic meaning
The term "gizzards" can also, by extension, refer to the general guts, innards or entrails of animals.

In popular culture
The Australian band King Gizzard & the Lizard Wizard references gizzards in its name.


Citations

General and cited sources
  • (2025). 9780030335037, Brooks/Cole Thomson Learning.
  • Dyce, Sack, Wensing, 2002. Textbook of Veterinary Anatomy Third Edition, Saunders. .

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