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.
सिर्फ पाउडर फेदर्स्‌ के रेशे लगातार उगते हैं और पक्षी के शरीर से कभी नहीं झड़ते ।