Why do geese have strong bills with hard lamellae?

Geese have evolved strong, deep bills equipped with hard, sharp lamellae to facilitate their specific feeding habits, which include grazing on vegetation and digging for roots and tubers. While some species use their bills primarily for grazing, others, such as the snow goose, possess bills that are heavy and robust enough to excavate food from the ground. These serrated structures are essential adaptations for their diet, allowing them to effectively manage and process plant material.12