The blind sacs at the junction of the small and large intestines of a fowl are called

The blind sacs at the junction of the small and large intestines of a fowl are called caeca. Caeca are two small pouches or sacs that are located at the beginning of the large intestine in birds. They are present in many bird species, including chickens and other poultry. The caeca serve as a site for fermentation of undigested food material, especially cellulose, which is a complex carbohydrate that birds cannot digest on their own. The fermentation process in the caeca helps to break down the cellulose into simpler compounds that the bird can absorb and utilize for energy. The caeca also play a role in the immune system of the bird, as they contain lymphoid tissue that helps to protect against disease.