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Black flight feathers
The black primary and secondary flight feathers - the large and rigid feathers of the wings - of the greater flamingo (Phœnicopterus roseus) allow it to fly. Hidden by its clear cover feathers when on land, they unfurl and are clearly visible when in flight. Flamingos sometimes lose all their flight feathers simultaneously during their prenuptial molt and are obliged to wait for their regrowth to be able to fly.
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