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Articles on Feathers

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Geese fly day or night, depending on when conditions are best. sharply_done/E+ via Getty Images

How do geese know how to fly south for the winter?

Geese honk loudly and point their bills toward the sky when they're ready to start the migration. Here's how they know it's time, how they navigate and how they conserve energy on the grueling trip.
Shown as bright orange and pink highlights under X-ray fluorescent light, birds incorporate metals like zinc and bromine into feathers as they grow. Nature Scientific Reports

Hidden feather patterns tell the story of birds

Ordinary grey bird feathers placed under X-ray fluorescence reveal beautiful patterns of elements like zinc, telling a story of feather growth and the environments the birds have experienced.

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