Beta-Keratin is a type of protein found in the skin, feathers, and scales of various animals, particularly reptiles and birds. It is a fibrous protein that contributes to the structural integrity and protective functions of these tissues. Unlike Alpha-Keratin, which is found in mammals, Beta-Keratin has a different molecular structure that allows it to form tougher and more rigid structures. This protein plays a crucial role in the evolution of birds and reptiles, providing them with the necessary strength and flexibility for their unique lifestyles. Beta-Keratin is also important in the formation of feathers and scales, helping to protect these animals from environmental factors and physical damage.