The barbs of powder feathers ​ — the only feathers that grow continuously and are never molted — ​ break down into a fine powder that is thought to help waterproof the bird’s plumage.
विमानासारख्या या आकारामुळे प्रत्येक उड्डाणाचे पीस एका लहानशा पंखासारखे कार्य करते.