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Feathers can be classified based on the structure of their quills into different types, with the primary categories being contour feathers, flight feathers, and down feathers. Contour feathers have a central shaft (quill) and are responsible for the bird's streamlined shape, while flight feathers, such as primary and secondary feathers, are specialized for flight and have a robust quill. Down feathers, on the other hand, lack a prominent quill and provide insulation. Each type serves distinct functions related to a bird's physiology and ecology.

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2mo ago

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