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Frontal shield
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<p>A frontal shield, also known as a facial shield or frontal plate, is a feature of the anatomy of several bird species. Located just above the upper mandible, and protruding along the forehead, it is composed of two main parts: a hard, proteinaceous callus and a soft, fleshy <a href="/facts/Corium_(anatomy)/WAm7Fd6P">corium</a>. It is thought to play roles in protection, mate identification, sexual selection, and territorial defense. </p>