The gizzard of a bird is a highly muscular structure lined with a tough, abrasive keratin-like layer called koilin. The sandpaper-like grinding action is assisted by grits and stones deliberately ingested. This action is enormously powerful and can even deal with pieces of metal. Flint Chips are suitable for all poultry birds, small or large, wild or caged. It contains flint chips that act as grinding agents in the gizzard to aid digestion.
