Why do birds preen their feathers?

Birds preen their feathers to keep them clean, aligned, and functional. During preening, they use their beaks to remove dirt, parasites, and debris. They also distribute oil from their preen gland, located near the base of their tail, which waterproofs their feathers and keeps them flexible. Properly maintained feathers are essential for flight, insulation, and display during courtship. Preening is a vital behaviour for a bird’s survival and well-being.