Since very early days, humans are very fascinated with understanding the concept of how birds can fly, and how birds (like duck) can protect their wings during swimming or rainy condition. You have been already noticed that the bird’s wing does not get sloppy, easily during rain or rainy season. So, this is mainly considered keratin (β-form) protein may involve for providing mechanical support to the feather, and thereby prevents feather to get sloppy. To further understand this concept, Filshie and Gogers (1962) analyze feather under transmission electron micrographs, and their study reveals the filament-matrix structure with the β-keratin filaments. This structure was about 3 nm in diameter and embedded in an amorphous matrix