Many species have black feathers on the trailing edge of their wings, regardless of what color most of their feathers are. Birds as different as gulls, pelicans, storks, and flamingos all have black-tipped wings. These flight feathers are rich in a pigment called melanin. But melanin doesn’t just provide color. It also helps make feathers stronger. Feathers with melanin have a tougher layer of keratin, the same substance found in human fingernails, compared to feathers without. So the black feathers actually help protect a wing from wear and tear.
More info and transcript at BirdNote.org.
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