Mandible
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<birdfyi-glossary slug="mandible"></birdfyi-glossary>Définition
Either half of a bird's bill; the upper mandible (maxilla) and lower mandible together form the beak.
Explication détaillée
Bill shape reflects dietary specialization with remarkable precision: crossbills have crossed tips for extracting conifer seeds; flamingos have a bent bill for upside-down filter-feeding; spoonbills sweep the lower mandible laterally to detect prey. The bony core (rhamphotheca) is covered in living keratin that grows continuously. Bill length, depth, and curvature are primary characters for species identification and ecological guild classification.