True Grit! Premium Poultry Grit for Backyard Chickens | 5 lbChickens don t have teeth. They eat grit and stones that go into their gizzard to act as a natural grinder.Your coop may not have any stones or the right size to aid in digestion of their grains and feed.We ve chosen the perfect size granite limestone and food grade diatomaceous earth with Redmond Brand Clay conditioner.