Feathers are most important parts of a bird. Only birds have them and although us humans notice them mainly for their beauty, feathers are a marvel of nature. Many scientists would have you believe that they evolved from reptilian scales over millions of years, but I think if you will check out the intricate design and uniqueness of the feather you will have as much trouble swallowing that theory as I do.
What is a feather made of and what does it do for the bird?
Biologically speaking, a feather is an outgrowth of the skin, much like hair in mammals. Like the scales and claws on their feet, and the sheath of the bill, feathers are keratinous or composed mostly of fibrous protein.
They act as insulation for the owner, assist in flying, provide camouflage, help secure a mate, protect against injury and are usually waterproof. There are at least five or six kinds of feathers that have been classified by ornithologists.