Largest organ of the body of poultry

Largest organ of the body of poultry is Gizzard.
This specialized stomach constructed of thick muscular walls is used for grinding up food, often aided by particles of stone or grit. In certain insects and molluscs, the gizzard features chitinous plates or teeth.
The gizzard can grind the food with previously swallowed grit and pass it back to the true stomach, and vice versa.