What role do stones play in an ostrich's digestive system?

Stones, or gastroliths, play a crucial role in an ostrich's digestive system by aiding in the mechanical breakdown of food. Ostriches do not have teeth, so they rely on these swallowed stones to grind and crush plant material in their gizzard, allowing for better nutrient absorption. This process is vital for their digestion, particularly since they primarily consume tough vegetation. Additionally, the stones help to mix the food with digestive enzymes, enhancing the overall digestive efficiency.