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Wing of a Bird, Showing the Arrangement of the Feathers

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Wing of a Bird, Showing the Arrangement of the Feathers.jpg Bald EagleMiniaturesCommon Tern, AdultBald EagleMiniaturesCommon Tern, AdultBald EagleMiniaturesCommon Tern, AdultBald EagleMiniaturesCommon Tern, AdultBald EagleMiniaturesCommon Tern, AdultBald EagleMiniaturesCommon Tern, Adult

The longest feathers or primaries (PR) are borne by the two fingers (2 and 3), and their palm-bones (CMC); the second longest or secondaries are borne by the ulna bone (U) of the fore-arm; there is a separate tuft (AS) on the thumb (TH).