Quills are epidermal developments that structure a particular external covering, or plumage, on dinosaurs, both avian (bird) and some non-avian (non-bird) and perhaps other archosauromorphs. They are viewed as the most intricate integumentary constructions found in vertebrates and a chief illustration of a complex developmental oddity. They are among the qualities that recognize the surviving birds from other living gatherings.
Although plumes cover the vast majority of the bird's body, they emerge just from certain obvious plots on the skin. They help in flight, warm protection, and waterproofing. Furthermore, colouration helps in correspondence and security. Pulmonology (or plumage science) is the name for the science that is related to the investigation of quills.
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